I'm trying to open the drum. It's a bit loose but it won't come out.
Tips are welcome.

I spend a whole day washing and waxing the car and then I noticed that the right rear wheel is jammed...

taken the handbrake off?

Yep. I think it was the hand brake jamming the wheel.
I somehow managed to get it spinning again without opening the drum.
But what about the next time the wheel jams or something...?
Do I need a special tool for opening the drum or should I just hammer the hell out of it?

Use a crow bar (the angled end) around the edge of the brake drum, and carefully tug it off, moving round the outside of the drum!

Cheers

The brake shoes wear the inside of the drum so produce a recess into which the brake shoes are pushed, there is now a lip around the drum which you are having trouble getting over the brake shoe, brute force needed I'm afraid but once you get the edge of the drum over one of the shoes you should be able to prise it over the other one and then it's simply using the crowbar to edge it off bit by bit. Clear as mud!

Slacken off your handbrake (either on rear of lever or over gearbox depending on model)

If you then lever the handbrake actuating lever away from the backplate of the stuck drum you can pull out a nylon stop from the rubber boot.

This should give you an extra bit of play if the drums are worn.


Will

Thanks to everyone for the advices
I think I'm going to check the rear brakes when get home from work...

Damn this is a great forum!