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Selecting "Round" thumb hole on the spec sheet 4.4.1   thumb   The thumb hole is the largest hole on the ball and the one most responsible for the bowler's ability to release cleanly and consistently. Before entering thumb measurements, the spec sheet requi...

Entering thumb hole size 4.4.2   thumb   Once the thumb hole shape is selected, the spec sheet requires the actual size of the thumb hole. Whether the bowler uses a bare thumb, a slug, or an insert, the size entry tells Spectre Cloud — and ultimately the dr...

Entering bowler's span (Full and Cut to Cut) 4.4.3   thumb This page walks through the process of entering a bowler's span measurements into the Spectre Cloud spec sheet form. For a full explanation of the difference between Full Span and Cut to Cut me...

Entering vertical and lateral pitch for thumb 4.4.4   thumb   Thumb pitch works on the same principle as finger pitch — the hole is drilled at an angle rather than straight down, tilted to match the natural resting position of the bowler's thumb. However, t...

Installing a pre-drilled thumb insert 4.4.5   thumb   A pre-drilled thumb insert arrives from the manufacturer already bored to a standard inner diameter. Rather than drilling the thumb hole to the bowler's exact size and shaping it in place, the operator s...