Product review (5 stars): A couple tips for installing
Here's a tip for installing.  I had all kinds of trouble keeping the belt untwisted, flat side down, and in the right place (look where the paint is worn) across the top of the tumbler drum.  Finally I used a couple of pieces of duct tape and taped it on temporarily.  After that, the installation went OK.  Go around the drive pulley first, its easier to slip it on the idler when everything is tight.  Take the duct tape off and you should be good to go.