I've never worked an a three-speed before. I got a 1965 Cavalier (Raleigh) off CL for $20 last year, and it has just worked.
The other day the indicator spindle (I think that's the name, the chain running into the hub that shifts gears) fell out. I retrieved it, and after some research online, it seemed like I could simply screw it back in. There are threads on the spindle. Unfortunately, this doesn't work. Any suggestions? Did I lose a piece when it fell out of the hub?