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OK, got the regulator apart. Nothing really broken like you thought resonateur. From what I can tell the small round spring that fits in the cap and holds onto the crank mechanism was stuck/rusted in the cap, so the crank was binding. Took all apart and cleaned I think it'll work ok when greased and reassembled. There is some wear on the crank where the spring grabs the unit but I don't think it's so bad it'll bind.
Attached are a couple pics. The closeup with the screwdriver pointer shows the damaged area
SoI think I'm good with it. And resonateur if you've still got the stainless rivets I'll gladly take you up on that. You can pm me. I believe the rivets I have are aluminum
Then I'll get that Big spring back in place, hopefully with no blood shed or surprises hahaha
Sent you a message. You can set the crank and "spring" into the cap and they should rotate by hand without binding, before you re-assemble it all. I think all that spring does is create a little interference drag to minimize wobbling or slop in the crank gear. I agree, that the little wear you see should be not issue...if there was rust, that's your answer. Lube it all generously with light grease, including the bushing, the pivot on the regulator lift and the toothed gears on the crank and the regulator arm. While its apart, you might want to take a needle file to the splines for the crank handle and clean them up. Nice job....nobody got hurt.
....unless you’re referring to blind (pop) rivets. They can probably be set without removing the stop pin. The ones I use are semitubular rivets and the must be set from the back side. They look like the originals.....
