I had this happen to me about a year ago. The threads on the locks had been stripped from over tightening. If you can still back the lock out I would try that first to check the threads. It's an easy fix and SS of course has the parts. I had to take the headstock off of the way tubes and hacksaw out the threaded rod on mine to fix the problem. Lesson learned the hard way. Don't over tighten the lock.
Enjoy a little sawdust therapy
520, Joiner, band saw, Planer, Dust Collector, 6: Belt Sander, OPR, Scroll Saw