Removing unremovable front drum

Try backing off the adjustment. Sometimes the old shoes cut into the drums, and keep them from slipping off over the shoes.

Hughie wrote:

If it spins freely and the shoes aren't dragging to prevent it coming off, then one of the bearings (outer usually) is frozen to the spindle shaft. You can try a mallet on the back side of the drum edge or a big 3-arm puller. If neither of those budge it, heat the outer bearing inner race with a small propane torch to expand it slightly. Best if you do this with the puller applying tension. (As a precaution, have some fire extinguishing agent handy.)

Speedy Jim