Just picked up this sweet setup a 8" dayton grinder and a columbian #406 with swiveling rear jaw on a neet old metal fabricated bench. Anybody guess whats hammered down in the tappered hole for rear jaw. Its a 3" japan spark plug socket that reads 5/8". Thinking of grinding two flats opposite eachother to get a wrench on it. Anyone have one of these so I can know what the original pin is supposed to look like? I can't believe the casting didn't split down the parting line when the p.o. hammered the socket in.


