i got the cover off, been there once before. drum, i can move out about 1/4 inch, then binds an don’t want to go any more. (SOME-body had it off before, and broke part of backplate where large o-ring is). i wont mention my name. can shoe’s bind from old worn out shoes and drum. it’s my 2000 450 es. drum will move forward and backwards, out, till about a 1/4, and back in. kinda like a spring is involved. i feel like it only go’s out to a groove, where shoes catch, and put it in a bind. perhaps old shoes dug into the drum. if the drum is catching the shoe’s on the way out, i cant see using the torch to heat the outside of the drum.