Hi Alwood, I have never seen or heard of it being done personally, the design of the captive cotter may preclude it; I would consider consulting a professional engineer and see what he thinks.
I have just bought a new inner clutch half (5/8") for my Scotty 45 with the grub screws....I find them a much better fixing method than the captive cotter system....1 screw locks the PTO shaft key in position, and the other at 90 degrees onto the shaft itself.
To aid in cutter clutch adjustment, you can just slide the clutch assembly to the correct position and lock it down, and you're done. Easy-peasy!
Anyway Alwood, all food for thought.
