NS7 2 Mic/Aux Knob is loose; won't adjust volume; only works at highest setting

This also happened to me on the aux/mic on my original NS7. Now it's happened on my NS7 2. It's only on the mic/aux volume adjust knob. It's completely loose and doesn't have a sticky feel to it. It just moves back and forth and doesn't adjust the volume. It keeps it at the highest volume, even if I take off the plastic knob and adjust the metal uncovered knob.

Haven't been able to find an answer for this in over a year, so I thought I'd post a topic.
Thanks!
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