Ted, I got lucky(thanks to Mercedes design). I just repaired my knob! I took out the gauge cluster( I do it often so it is never really in there- I can pull it out while driving !) I also took off the lower panels( Hey! I have a C.B. radio). The small pot metal box with the end of the wire, and the cams that move in and out, had the top pop off. I was able to locate the top( and a small screwdriver lost previously), hiding up in all the wires. I regreased everything and pinched the top back on with pliers. I am so glad it was repairable. Any other car would have needed a new cable, I'm sure! Thanks for the input