[davemc]

I took the O-Ring idea but instead added a small O-ring around the knob shaft. My problem was that the knob shaft was NOT turning the upper pulley - just slipping. I then strung the dial cord as in Ron's diagram, using Philco 45-1135 Dial Cord, which is thick and very flexible. It now works great. Apparently the upper pulley, which is some sort of fiber construction, was worn and there was not enough friction between the pulley and the knob shaft. The small grommet around the knob shaft seemed to solve that. I don't know how long it willl last. Perhaps a better solution would be to remove the top (single) pulley and lever completely, and fabricate or purchase a pulley for the knob shaft that then drives the mechanism and REPLACES the hinged upper pulley.