If your strong enough, push the button with your thumbs and turn the PTO until it lines up with the slots, or put a 3-jaw puller on it and crank it SLOWLY untill you can spin the PTO freely. After you line up the holes with the slot, unscrew it and its stuck in place. Also when you get the set screws , there's usually debris down inside, good to flush out with compressed air, and there's not 3, there's 6 total, there one on top of the other so two in each hole!
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