Originally Posted by
shortshorts
I read on Sheldon Brown that if the prongs are broken off (they are) then I have to disassemble the freewheel and clamp its core into a vise. I haven't figured out how to take it apart though.
There should be an article about "destructive freewheel removal" either on Sheldon's site or the Park Tools site, but:
The top plate of the freewheel is threaded on. Look at the plate carefully- there should be two small divots in it. Get a punch and unscrew the plate (I can't remember if it's right- or left-hand thread). Once the plate comes off, remove the cogs and their half of the body (and be prepared for zillions of small ball bearings all over the floor). Clamp the remnants of the freewheel in a sturdy bench vice, and heave! The carcass of the freewheel should come off.