I finally got around to cleaning up the 77 P10, while wiping down the stem I noticed a hairline crack in the clamping area. Guess all that talk about 70s Atax stems being "death stems" wasn't all talk. I was looking at the top of the expansion slot and didn't see the crack until I set it on the work bench. Crisis averted, this will probably be a paper weight or something. Glad I took the time to check it out.