how to remove a stuck left rear brake drum

Some older models you can stick a small screw driver in back side plate and turn the adjuster to minimum. Install bolts into threaded holes on front of drum. (Most are threaded for 1/4 inch bolts I believe) Tighten bolts into drum they should push agains lug stud plate and force drum off. Tape side of drum with hammer as tightening the push bolts in this should break it free. Might even want to jack up both rear wheels and turn opposite wheel (car in neutral) this will cause axle to turn braking the pads loose from the drum. Hope this helps

Another way to get a stuck drum off is to go to the back side of the Backing Plate and grind the heads of the Spring Pin Retainers off with a die grinder. The pins of course, look similar to a framing nail with the "head" on the outside of the backing plate. Care should be taken to not damage the backing plate, but once the heads of the retaining pins have all been ground off, the drum, shoes and a few other connected pieces can be pulled off all at once.

This is the position I am in also, l have been doing this many years. Looking at the problem decided to use cutoff tool or cut pins. I've been working on cars many years never had this problem, at least you confirm my solution Thank you.