I'm with OldSub.
Just adjust your shoes in, pull the screws that hold the drum on, and pull the drum off. You CAN get at the cylinder with a minimum of muss and fuss.
I changed all of them out on my truck and there were no problems whatsoever working around the hubs.
If you're working on a "Farm Fresh" truck that has been sitting for a while, I still think it will be easier to pull the drum off. You will need a big hammer, though.
