Mine seems to work properly, but the little white twist knob is broken right at the threads. I was hoping it could be repaired or replaced, but I'm afraid the entire cable assy is going to need replacement. Any thoughts?

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1960 MB 190Db w/ full sunroof
1985 Toyota Pickup
2006 Honda Odyssey EXL R&N
2001 VW Jetta GLS TDI