This is probably a really dumb question but if anyone is kind enough to take the time to reply I would really apreciate it. I have to replace the transmission on a walkbehind. No problem, except that I have no idea how to remove the transmission pulley underneath the engine deck. Holding the pully on to the shaft theres a kinda star-shaped knob. There's also a key involved somewhere in there also. There's 2 pics below because I probably didn't describe it very well. Can anyone help me remove this pully? Thank you.