Keystoker says that 1.5 to 2"s the best setting to start at, and I've always seen them set at 1.5" when you go to clean one for the end of season folks. I played with added height,(2") AND here is a thought: Better free up those 2 5/16" bolts BEFORE you try something stupid. I've been called to fix a few, and that is NOT FUN....especially with a full hopper. If you can get them out, anti-seize the hell out of the whole area. With the hopper off, you can also look over the 'pusher' mounts and square heat anchor bolts. My .02 says to soak them, and have heat handy if you want to be successful in removing to exchange the shaft, bearing ends, right and left......... When installing a new one, I disassemble the whole rig , even the side plates in the stoker and anti-seize the whole rig. MUCH easier at that time, VS 3 years LATER. Wiz: Great video and presentation, and should be part of the manual from the boys over in the Haven. If you neglect to follow instructions, you and the 'Fire Wrench' will become Fast friends!