4.5 — Thumb Measurements
4.5.1 Selecting the thumb hole shape (Round or Oval)
4.5.1 thumb The thumb is the largest hole on the ball and the primary control point for the re...
4.5.2 Entering thumb hole size
4.5.2 thumb For a round thumb, the hole size is a single value entered on the spec sheet. The ...
4.5.3 Entering vertical and lateral pitch for thumb
4.5.3 measurement Thumb pitch works exactly like finger pitch — you enter it into the pitch ...
4.5.4 Thumb insert type and size
4.5.4 thumb Many bowlers use a thumb slug or thumb insert rather than a bare thumb hole. This ...