I had the same problem - the flex cables are an expensive piece of trash! I have drilled for holes in the focusing knob of my Beseler and put in 6-32 screws about one inch long - they stick out like spikes. I have a couple of different lengths offlat wood (left over moulding I guess) in which I drilled one hole slightly larger than the screw. Slip the hole over a screw and you have 2 or 3 positions to place the stick - varying lengths etc. If the hole is just a bit larger than the crew it slips off easily not moving the focus. Works like a charm and cost about zero! Hopes this helps.