How To Drill A Bowling Ball: 12 Steps (with Pictures) - WikiHow

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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow How to Drill a Bowling Ball PDF download Download Article Co-authored by Chad McLean

Last Updated: April 1, 2025

PDF download Download Article
  • Preparing to Drill
    • |
  • Drilling the Ball
    • |
  • Video
    • |
  • Expert Interview
    • |
  • Q&A
    • |
  • Tips
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  • Warnings
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This article was co-authored by Chad McLean. Chad McLean is a professional bowler, a bowling ball designer, and the Technical Director at Storm Products based in Brigham City, Utah. He started playing at just three years old, and developed a passion for bowling that carried through high school into his adult life. After bowling for nearly his entire life, during college Chad managed a pro shop at a local bowling alley where he learned through hands-on experience all about fitting hands, drilling balls, and the science of bowling ball manufacturing. He’s internationally recognized as one of the most sought-after ball drillers and technical coaches in the world. He has worked for 10 years at Storm Products and oversees ball development for multiple brands, shipping bowling balls worldwide. Chad has multiple 300 games and 800 series and has been inducted into the Guinness Book of World Records seven times for bowling-related feats, most recently for the “Tallest Stack of Bowling Balls” with 11 balls broken at Storm headquarters. He currently holds the record for the “Most Strikes in 60 Seconds” at 12 strikes and the “Most Bowling Balls Held Simultaneously” with 16 balls. He also travels globally to teach bowling, conduct seminars, and educate others on the technical aspects of the sport. This article has been viewed 145,843 times.

If you've never purchased a brand-new bowling ball before, you might be surprised to learn that new balls often come without holes drilled in them. If you are a serious bowler, it's very important that the hole configuration on your ball fits your hand comfortably and is angled for the best grip. Additionally, different hole configurations and depths may alter the way the ball behaves. Drilling new holes in a bowling ball is usually handled by a professional, and in most cases, that's probably the best approach. However, it is possible to do it yourself!

Steps

Part 1 Part 1 of 2:

Preparing to Drill

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  1. Step 1 Choose a ball. 1 Choose a ball. Choose the bowling ball that's right for you, based its weight and the materials it is made of.[1]
    • Bowling balls can be made of plastic (the cheapest balls), urethane, reactive resin, or particle. Each of these different materials provides differing degrees of friction, power, and control.
    • If you can, it's a good idea to experiment with different types and weights of balls before selecting one. Once you drill a ball, it's yours for good.
  2. Step 2 Choose a hole configuration. 2 Choose a hole configuration. Different finger hole configurations will provide differing amounts of control and power. Choosing the configuration that's right for you will require you to assess your own strengths and weaknesses as a bowler.
    • A conventional grip is achieved by drilling holes deep enough so that your fingers and thumb are inserted into the ball up to the second knuckle joint. This is the traditional bowling alley ball configuration because it is the easiest to control. It is the recommended configuration for beginners and players of moderate skill.
    • A fingertip grip is achieved by drilling holes that allow your fingers to be inserted into the ball up to the first knuckle joint. This is an advanced configuration that is much harder to control, but provides increased lift, power, and spin.[2]
    • A semi-fingertip grip is achieved by drilling holes that allow your fingers to be inserted into the ball between the first and second knuckle joint. This is a happy medium between the grips described above and is easier to master than the fingertip grip while providing more power than the conventional grip.[3]
    • There are also other types of grips, such as the Sarge Easter grip, but the three above are the most common.
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  3. Step 3 Measure your span. 3 Measure your span. Measure the distance from the base of your thumb to the points at which the two fingers you will use to hold the ball will bend (some people prefer the forefinger and middle finger while others prefer the middle finger and ring finger).
    • For a conventional grip, this means measuring from the base of the thumb to the second crease in the appropriate fingers. For a fingertip grip, measure to the crease closest to your fingertip.
    • Using an adjustable bowling ball makes this process much more precise and is strongly recommended. Adjustable bowling balls have movable holes and various depths of finger inserts. A bowling ball manufacturer, sports and recreation store, or possibly your local bowling alley probably have a measuring ball.
    • If you do not have access to an adjustable bowling ball for measuring your grip, you can simply place your fingers onto the surface of your un-drilled ball and mark around each finger once the placement feels comfortable. This isn't as exact, but it is comparable.
    • Alternatively, you can also measure your span using a compass or calipers, keeping your fingers together and thumb out, and then reducing your measurement by about 1/8 of an inch (or 1/4 for a fingertip grip).
    • To determine the depth the holes will need to be without a measuring ball, measure the distance from the edge of your span to the ends of the fingers that will be going into the holes.
  4. Step 4 Record your measurements. 4 Record your measurements. Write down both your finger depth measurements and the distance between holes for reference when drilling.
  5. Step 5 Decide on an angle. 5 Decide on an angle. Having an angle that fits your hand is crucial for comfort and performance. For example, if the holes are angled forward, the ball will have more lift when released because your fingers will remain inside until the last minute.
    • This is a decision you'll have to make based on what's comfortable for you, as well as your individual strengths and weaknesses as a bowler.
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Part 2 Part 2 of 2:

Drilling the Ball

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  1. Step 1 Clamp the ball in place. 1 Clamp the ball in place. Place the ball into a tight clamp to ensure that it does not move during drilling.
    • If the ball moves during drilling, the holes may come out uneven, making the ball uncomfortable to use or difficult to control.
  2. Step 2 Mark the ball. 2 Mark the ball. With an erasable marker or piece of chalk, mark the hole configuration, placing a mark at the center of the spot you plan to drill each hole. Use your span measurement to assure the holes will be properly placed.
    • When bowling balls are molded, they are suspended by a small rod that, when removed, leaves a hole that must be filled in. This is called the "pin." You should avoid drilling through the pin, as this may void your warranty and negatively affect the ball's performance. Make sure your nearest hole is at least an inch away from the pin.
    • The pin should be easy to locate. It is usually a different color than the rest of the ball.
    • For advanced ball drillers, the pin is used to determine properties of the bowling ball's core that can be used to determine the ideal location on the ball to drill finger holes, depending on the qualities you want the ball to have. This will vary from one model of ball to the next, so if you want to try this, you should consult the instructions that came with your ball.
    • It's a good idea to double check your marks against your span measurements before drilling. Once the holes are drilled, they are permanent.
  3. Step 3 Select your bits. 3 Select your bits. Determine the correctly sized drill bits to create comfortable holes for your thumb and fingers.
    • You can determine this easily if you used a sizing ball to get your hand measurements, as these balls also provide information on your thumb and finger widths. If you did not have the benefit of a sizing ball, a good way to determine this is to experiment with different bits, drilling holes of different sizes into a block of wood and then determining which ones most comfortably fits your thumb and fingers.
  4. Step 4 Insert the first bit. 4 Insert the first bit. Prepare your bowling ball drill with the proper bit for your thumb width.
    • It is strongly recommended that you use a bowling ball drill. Attempting this with an ordinary drill may damage your ball.
  5. Step 5 Drill your thumb hole. 5 Drill your thumb hole. Drill the hole slowly at your desired angle, checking the depth often so as not to drill too deep.
  6. Step 6 Switch bits and drill the finger holes. 6 Switch bits and drill the finger holes. Swap out the drill bit and drill the two finger holes. As with the thumb hole, check the depths often to avoid drilling too deep.
  7. Step 7 Sand the holes. 7 Sand the holes. Replace the drill bit with a sanding attachment and sand the interior of the holes until they are smooth and our fingers slide in and out easily and comfortably.
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Community Q&A

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  • Question I had the bowling ball for years, and now the holes are too big. What can I do to adjust the holes to my size now? Community Answer Community Answer A pro shop can plug and re-drill your holes. It's common for your hand to change over time. Higher performance balls are not expected to last for more than a few years. Casual bowlers are more likely to have the issue of their ball not fitting after some time. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 1 Helpful 10
  • Question If a ball is already drilled, can I have it re-drilled? Community Answer Community Answer A pro shop can always plug and re-drill the ball. They also will tell you if your ball is suitable for re-drilling. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 2 Helpful 3
  • Question Do I drill the thumb first and then the fingers, or reverse that? Community Answer Community Answer Either way works, but you may find it easiest to drill the fingers first, then you only need to intersect the fingers spans for the thumb hole. If you do thumb first it is harder to be accurate, because you have to make two separate span measurements for each finger. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 6 Helpful 4
See more answers Ask a Question 200 characters left Include your email address to get a message when this question is answered. Submit Advertisement

Video

Tips

  • A correctly drilled ball can make the difference between defeat or victory. A serious bowler may wish to have multiple balls with different hole configurations so that he or she can choose the one that works best based on the condition of the lanes at bowling time. Thanks Helpful 0 Not Helpful 1
Submit a Tip All tip submissions are carefully reviewed before being published Name Please provide your name and last initial Submit Thanks for submitting a tip for review! Advertisement

Warnings

  • Do not drill a bowling ball without prior knowledge of power tools or drill safety. Bowling ball drilling is usually done by professionals. Thanks Helpful 7 Not Helpful 4
  • Improper drilling techniques or tools may void the warranty on your ball or otherwise damage it permanently. If you choose to drill your own ball, you should be aware of these risks. Thanks Helpful 0 Not Helpful 0
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Expert Interview

Thanks for reading our article! If you’d like to learn more about bowling, check out our in-depth interview with Chad McLean.

References

  1. ↑ Chad McLean. Bowling Expert. Expert Interview
  2. ↑ https://www.bowlingball.com/BowlVersity/how-to-adjust-to-a-bowling-fingertip-grip
  3. ↑ http://www.bowlersreference.com/Bowler/GrippingTheBall/

About This Article

Chad McLean Co-authored by: Chad McLean Certified Bowling Coach This article was co-authored by Chad McLean. Chad McLean is a professional bowler, a bowling ball designer, and the Technical Director at Storm Products based in Brigham City, Utah. He started playing at just three years old, and developed a passion for bowling that carried through high school into his adult life. After bowling for nearly his entire life, during college Chad managed a pro shop at a local bowling alley where he learned through hands-on experience all about fitting hands, drilling balls, and the science of bowling ball manufacturing. He’s internationally recognized as one of the most sought-after ball drillers and technical coaches in the world. He has worked for 10 years at Storm Products and oversees ball development for multiple brands, shipping bowling balls worldwide. Chad has multiple 300 games and 800 series and has been inducted into the Guinness Book of World Records seven times for bowling-related feats, most recently for the “Tallest Stack of Bowling Balls” with 11 balls broken at Storm headquarters. He currently holds the record for the “Most Strikes in 60 Seconds” at 12 strikes and the “Most Bowling Balls Held Simultaneously” with 16 balls. He also travels globally to teach bowling, conduct seminars, and educate others on the technical aspects of the sport. This article has been viewed 145,843 times. 107 votes - 60% Co-authors: 12 Updated: April 1, 2025 Views: 145,843 Categories: Bowling In other languages Russian Italian
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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Chad McLean Co-authored by: Chad McLean Certified Bowling Coach 107 votes - 60% Click a star to vote Co-authors: 12 Updated: April 1, 2025 Views: 145,843 ( Rev. ) Jimmy Galloway

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