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Custom bowling ball hand measurement tools.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...s_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...ment_tools.jpg
Previously:
https://www.homemadetools.net/forum/...537#post132301
https://www.homemadetools.net/forum/...438#post107444
While in college I worked in the sporting goods department for a department store in Ohio in the 70's. One of my jobs I used to measure (using one like on the right) and drill bowling balls. Christmas was a crazy time. They would sell the balls undrilled then people bring them back in January to be measured and drilled. Never kept count of how many I drilled, had to be in the 1,000's.