Originally Posted by cpt_crunch
Its ugly but it was quick. Also I think the lug may actually be a 1/4-30 but that's not UN so I picked the closest UN thread. Also it doesnt really matter if you're making your own anyway
I was actually able to snag the dimensions from the AutoCocker owner's group on Facebook. I need to upload my .slddwg file I made of it...it might simplify things.
The thread ended up being 1/4-28 for the timing lug and the OD was .679."
I whipped it up on the lathe at school out of a piece of scrap SAE1018, and so far it works like a charm!
Thanks for all the help, guys, I now have a valve and hammer! I just need to figure out how to make hexagonal holes for the jam nut and IVG...