I was just getting my 80 air-cooled ready for winter and when I removed the
 oil filter and parts from the relief valve on the engine/filter  housing
fell out. Holy s**t.  It was a spring, ball bearing, and  press fit retainer.
My Guru said to expand the retainer a bit and put them back in. I did so
and so far nothing bad has happened after 50 miles driving

Dogged a bullet, I hope.

Jim Morgan

80 Air-cooled" stink bomb"