This may be a stupid idea (many of mine are), but could one put a "sleeve" with an ID of 3/8" and an OD of 7/16" and a length = the length of the hole in the ball between the stud and the ball? That would allow use of the matching 7/16" hole ball and rocker with the 3/8" stud. The wall thickness of the "sleeve" would only be 1/32", so the material it was made from would have to be pretty stout.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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