There's some sort of metal bracket that goes around the end (where control knob is). It looks like it snaps over the little joystick. It's what the allen screw goes into. Mine broke and I can't get the panel on without it.
I may have one of those,I just gutted some doors and saved all the stuff I took out even the mirrors with cables.I will look today and get back to you.Mike
I have one its on the mirror I dont now how to take it off but maybe I can send you the mirror or just the whole cable but its yours either way just take care of shipping.Mike