Have you done the horrid task of going in through the adjuster hole at the
back and run the adjuster in yet?
If not, that's the 1st step.

If you have - then throw on some headphones, and then pry at 9pm with a
screwdriver while bashing at 3pm on the edge of the drum.  Then go around in
a circle bit by bit.  This is assuming that the drum has frozen onto the
axle stub.