I need help with the extension set up all the way forward pls.
I put them on and thought all is good, but vibration over time caused the top extension to get loose. There was no lock nut, so thought I would remove 1 from the 1st metal piece furthest back. Problem is can not thread the lock nut on the furthest extension, tried both ways since I think is is reverse threading. Are the bolts different sizes? Am I just not tightening with wrench hard enough? 1st pic is 1st extension that nut won't thread, 2nd pic is lock nut and 2nd extension. I had to unscrew the piece furthest back and put lock nut back where is was without any extensions. Does this make sense?