Somewhere in my cave of forgotten tools along with a GI Ring Tool and a 216 oil pan targeting tool is a rocker arm jig block that held the rocker while it was bored oversize, a bronze bushing pressed in, and then a slightly undersize ream was run through it. It was then taken over to the Sunnen rod honing machine and honed to the rocker shaft size. New parts were nonexistant during WWII so there was much building up and grinding back, turning over to an unworn side, patching, sewing, vulcanizing, you name it. It was in this era that some unique machines and processes were invented. As said; necessity is the mother of invention.
