If it is to short you can add tape.
IF it is to long you can bevel it out some.
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Eric T. Spivey, P.E.
 Visionary Test Staff Member

Goto your driller and do this:

"Many of you probably know this. I have a problem dragging the back of my thumb in the back of my ball.

Mo Pinel in the recent one on one help session with Del Warren beveled in the following manner.While ring finger only in ball, while pulling thumb in and out he beveled the front of the hole. While middle finger only in ball he moved thumb up and down and beveled side of hole(left for me as lefty, right for you righties) until thumb stopped dragging in back.Interesting, most of my drag happened when my middle finger only was in the ball and resulted in more side bevel than I usually use! Or more than my ball driller usually introduces!

Note I've done some of my best bowling with tapered thumb holes which I believe introduce in a way more side and front pitch than you have drilled in your ball. Something this amount of side and front bevel does in a staight insert.

It was amazing to watch the drag just go away as he added bevel until there was no drag!

REgards,Luckylefty

PS Maybe this will help someone else out there. "

I got this from this site when I first started looking on here.  Print it off and take it to your driller.  He should be able to bevel the thumb for you until you get what you want.

GOod luck,

Eric
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Eric T. Spivey, P.E.
 Visionary Test Staff Member

Who's luckylefty?

Oh yeah!

REgards,

Luckylefty
PS I was saying hey that livespice sounds a lot like me with that tapered thumb hole bit, he hee heheheh!

If you use finger inserts with lifts you can go to none lift type and gain about 1/8 inch.

If not you are going to have to slug or plug it.

We don’t like to plug a thumb and drill back like this as the plug will often break out if you drill back thru the edge of it.

If no slug was used then you can probably use a 1 3/8 slug and get enough to correct the span.

If you already use a slug you can look and see if you moved the span whether or not you would drill out of the front of the slug if it was replaced.

If a slug was used and you would drill out of the front you could use (if possible) a larger slug to gain some distance. Say going from a 1 1/8 inch slug to 1 3/8 would give you another 1/8 inch to work with.