The times I have worked on the upper feeder shaft, I left it on the cornhead, blocked it up, and backed the combine away. This time I would try the tool to loosen the gib key. A pipe with an hammer impact head (and a notch to go around the key) and drive the pulleys in to loosen the key. I got the idea a few weeks ago on here for the lower header drive shaft and it works( used a BIG hammer). I would take the kotter key out on the opposite side, drive the pulleys away from the bearing, for clearance, then drive the pulleys off the key. What does everyone else thinkIJ