I'm removing a Woods L59 Belly Mower from my tractor. I have everything off except for the belt wheel attached to the PTO. For the life of me, I can't figure out how to get this thing off the PTO. There is no visible set screw or other devise that seems to be attaching it. I've used penetrating oil and have beaten it to death with a hammer an it still won't move. Any ideas? I have a cat 1 3-point hitch.