You could always do what I did the first time I removed a PTO from a cub motor.
After I removed 1 each set screw from each of the 3 holes in the PTO I could not get it to move, so out came the chain, wraped it tight around the PTO pully and began to snap the chain until the PTO came off.
This took a long time, and I found out why, there happened to be another complete set of set screws in each hole.
I found out the hard way that there is suppose to be 2 set screws each in each 1 of the 3 holes.
My second PTO removal went better, although I did happen to find 3 set screws in each hole on that motor.
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