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Here's how you can drill your own bowling ball at home without owning a pro shop. If you know nothing about how to drill a bowling ball, this may be too advanced for you. But if you are brave and have a general understanding of how bowling ball finger pitches work, this may be a fun project to try. Either way, have fun watching.
I'm not affiliated with Innovative Bowling Products, but here's a link to their web page:
innovativebowling.com