I fixed literally hundreds of them one way spragg clutches in printers where they were used to drive the ribbon feed, i would just take it apart , clean it and lube with grease
park cable cutter are awesume but if you don't have them cutting the housing and then facing the cut end with an abrasive disc works fine
If i couldn't set a star nut without a specal tool i would turn in my man card
edit: if greasing doesnt work replace the clutch, I used to carry a bunch of them