[Oldie Goldie]

I followed the instructions on the link another member provided.
Carefully took the shaft assembly apart. One screw was the devil to unscrew, frozen in its hole. Chewed up the head I had to file it to make it look half decent again.
Cleaned the black gunk out with lots of wd-40 and metal bristle brush.
Put the little ball bearings in, than the spring, than the next little ball bearings,than the inner shaft, than compressed everything and slid it home until it clicked into the outer ring. Than the lock washer. It works perfectly, the course outside control and fine inner control.
But a couple turns POP! It throws the inner shaft out and I'm back to square one!

I'm getting disappointed.