Q & D Instant Assignment: Drill and chamfer 10,5 mm holes thru a batch of 48 mm pool balls,
drill 2 of same thru a 50 mm trailer tow-hook, take down its thread from 20 mm to M16 x 2 mm
NOTE: 3-jaw "just barely" holding the ball while turning...

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Turn over and drill 10,5 mm into centre of ball, chamfer. Put in drill press at 130 deg - drill 10,5 angled hole from base, chamfer.

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Drill 10,5 mm and chamfer the 7 provided pool balls of lovely, smelly and dusty phenolic...

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Try-fit an 8 mm SS steel wire thru the works. (Dummy model prototype at bin's bottom)

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-Colorful and merry result, eh?

"-For those special times, where ordinary gag balls just won't hack it..."