Vacuum Grip
Best uses for Vacu fit: Bowlers who suffer from swelling or may be in between sizes.

Create a Vacuum Grip with this Simple Drill Technique.
NOTE: Please read instructions fully before drilling. For Tech Support call: 1-800-530-9878 or Int'l 586-598-3948.

1. Use 1 1/32" drill bit. Hole should be 1/16" larger than the recommended insert o.d.
2. Drill hole 1" deep.
3. Replace 1 1/32" drill bit with 31/32" or recommended insert outside diameter (for stronger vacuum use smaller drill bit i.e. 61/64 for
   standard outside diameter insert)
4. Drill hole the full depth of insert (Quad inserts 1 3/4", Standard 2-N-1 1 3/8")
5. You have now created a cone at the bottom of the hole.
6. Install finger insert. Glue bottom of grip into smaller hole. When creating a vacuum grip you must use at least 2 sizes smaller than standard finger tip size. Grip will expand to fit inside hole diameter.
7. Apply adhesive (Turbo Zip Plus-45 recommended) to the front of hole, between finger insert and bowling ball. ONLY apply glue to the front wall.

Download a printable version of the Vacuum Grip Drill Technique (pdf)

Switch Grip Drilling & Installation Guide
Switch Grip Interchangeable Thumb Inserts are revolutionizing the way bowlers and pro shops use bowling balls. Bowlers now enjoy the same feel from ball to ball and can quickly adjust to uctuations in thumb size without the hassles of taking tape in and out of thumb holes. You can even share equipment among friends if you all use the Switch Grip system. Pro shops are using Switch Grip to allow bowlers to try new equipment before they buy it. See our Try Before You Buy package in the Switch Grip section. Switch Grip is used by bowlers of all skill levels and has quickly become the most accepted and widely used interchangeable thumb insert on the market.

We have made significant improvements to the product since it was first introduced in 2004 including new Big Tabs which will bear over 180 lbs. of dead weight before they fail. But equally important to the quality and durability of the product is proper installation. To ensure the best results, proper drilling and installation instructions is required. Check out our Installation video for details.