Looking like you need a shop-hand mechanic to help out there Joe.
I think you'll have to move away from nylon and plastic bits and got for brass or steel. might last longer with the torques involved?
keep up the good work
“The Optimist sees the glass half full; the Pessimist sees the glass half empty. The Engineer sees the glass as ‘Twice as bloody big as it should’ave been in first place!!’…” Dorian Hindmarsh BEng Phd