I'll jump in here, there is a "slot" with a rubber plug (oval shaped) on the back side of the drum housing\rear end...remove the plug, and use a flashlight and look inside the drum thru the slot, you should be able to see a star shaped wheel, about an inch in diameter, this is your rear brake adjustment, it will turn either way when you reach thru the slot with a medium size flat screw driver, it connects to the adjustment lever, so you'll need to back off the tension on it to get the brake shoes to release. There will most likely be a ridge around the drum and you'll need to back it off enough to get the drum to pull off. You will know if you are turning the star wheel the right way, if the tire locks up, go the other direction with it.