Breathing new life into the 318 in the Scamp!
This one should be ok. It didn't actually come off. Just loose and it wasn't driven on it. I shut it off right away. It went back together flush, by hand. Torqued good, plasti-gaged good. We'll see. If it starts sounding ugly, I'll just pull it again and replace the rod. I think it's ok.
If I suspected the cap was out of square, I'd probably just find another cap, weight correct it, check it with a plasti-gage and if I couldn't get it to do what I needed it to do , just have it resized or replace the rod assembly with another one.