Jerry those Tecumseh carb diaphragms were used in several engines over the decades (including engines on augers and tampers). They're easy and cheap to get new still.
cleaned the gunk out of the diaphragm last night. the rubber is still totally flexible and moves easily with slight vacuum on the hole in the cover. pretty optimistic this is gonna be okay. just hoping all the crap comes out of the carb.
also, while i took the carb out i looked at the P&C. that thing is pristine, just like the diaphragm. i was wondering though where the h is the reed valve? does this thing not have a reed valve? there was a "block" between the carb and the engine but couldn't see where a reed valve would fit on that. did notice that there are two pairs of holes; one pair is where the "block" bolts on and the other pair is just above it towards the top of the cylinder. wondering what the top pair of holes does. curiouser and curiouser