A few people have posted that they wanted to run a geared motor in the opposite direction. I was playing with a Q100H, when I noticed that the clutch is completely symmetric from one side to the other, so it's a simple job to reverse it. The threads go right through and are equally chamfered on each side. It must be the same with the Q128, Q85 and Q75. You'd have to figure out the correct phase and hall sequence or use a controller with a reverse jumper.