You don't even need to take the rotor off. There are slots in the back cover that have rubber plugs in them. Pop the plugs and you can get to the starwheel with a flathead screwdriver or a drum brake adjustment tool (like $5 at your local parts store). Jack up the wheel and spin it while adjusting the starwheel. When you start to feel drag from the shoes, stop and give the starwheel a couple of flips in the opposite direction 'till the drag goes away.