I find this happening as well, over the weekend my PTO stopped working completely, I pulled the PTO unit and discovered all 3 "lock" nuts in the basket...
I go sort of back and forth with the initial nuts.. until I reach a place where the guide tool is perfect... then I attach the "lock" nuts...
I would check your springs... both the pressure plate and throw out...
You might have to creep one down a thread and then back it up..
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