Adjustable Thumb Insert - Want to Buy

[ok3609]

I am interested in finding an adjustable thumb insert similar to one I found in a house bowling ball. It is not an interchangeable insert. Instead, this one actually can be adjusted with a screw driver. The insert is blue and has a screw at the bottom of the hole which turns to enlarge or shrink the thumb hole. If anyone is familiar with this type of insert please post a reply.

Duane

[bowl1820]

That could be a Vise - Adjustable Thumb Insert
http://www.viseinserts.com/thumb_6.html
Check bowlingball.com see if they carry it.