Working on a Mousin Around that spent a couple years in someone's garage with no top glass. Lots of corrosion on metal bits, ramp flaps are solid rust. Have been dismantling and cleaning ramps, parts go into ultrasonic and metal parts then go into tumbler. Rusty ramp flaps get a vigorous scrubbing with aluminum foil and vinegar.
Rivetting everything back has proved challenging at best. A rivet press might be nice, but after shipping, customs fees, and exchange rate, it's like $450. Not happening.
I've learned that if you buy a c-clamp rivet clincher, make sure the rivet die at the fixed end is on some sort of extension. I can't rivet half the things because the body of the clamp itself requires a certain amount of clearance that is not provided with rivets at the edges of ramps, or on the flanges that hold microswitches. Probably (but not verified, as I do not have this) a better tool would have the rivet die on a threaded piece as well as the cup-shaped-rivet-holder-thingy (technically speaking).