I need help figuring out how to remove a broken woodruff key from the shaft of the gearbox on my 54D mower deck. When the key broke, it somehow sheared off cleanly to match the surface of the shaft, so there are no upraised edges I can leverage on at all. I have attempted using a hammer and punch to try and get it to move out of the well, but it hasn't budged and I am cautious about using too much force and messing up the gearbox bearings. I am considering trying to drill a hole in the key and using a screw to get something I can actually apply force to, but I don't know if I have the equipment (relatively new home owner as well so the work shop is pretty limited).
If anyone has a suggestion I would appreciate it.