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What is an oval thumb hole and why is it used? 5.1.1   KEY   concept   Most bowling balls are drilled with round holes — circular in cross-section, sized to fit the bowler's thumb or fingers at the point of insertion. For many bowlers, a well-fitted round h...

Oval terminology: Starting Bit, Oval Width, Oval Degrees, Taper 5.1.2   glossary TODO — write this page. ```html Before working with Spectre Cloud's oval calculator, it helps to have a clear understanding of the four key terms used throughout the oval thum...

Vertical cut (V) vs. Horizontal cut (H) — what they mean physically 5.1.3   concept   When making oval cuts at the drill press, the operator physically moves the ball relative to the drill bit along one of two axes to remove material and elongate the pilot ...

How oval degree affects pitch inside the oval 5.1.4   concept   When a thumb hole is round, vertical pitch and lateral pitch act independently — each one influences the thumb along its own axis without affecting the other. When the hole is oval, this indepe...