Since that pto has been off sometime prior to now, there may be or not two set screws per hole.
But do as Gregory suggested, but first use compressed air and while looking away blast those holes good to blow out anything in them like dirt and mud wasps. Then fill the three holes with kroil or 50/50 ATF and acetone, two at a time once a day for a week!.
I like to use the grinder on the allen wrench to put a good sharp, square end on the business end of wrench.
The question of how many set screws inside.........
Does anyone have a "standard" depth measurement from top of hole down to set screw(s) on the narrow frame pto?
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