In article , Arie de Muijnck   
    wrote:   
      
   > I have fixed items like that by inserting a small plastic plug between   
   > screw and main thread. The plastic deforms without damaging the main   
   > spindle thread, and securely clamps the spindle.   
      
   Thanks Arie.  If I have to drill out whatever is blocking the setscrew   
   from having effect, a plastic plug is a good idea to avoid damaging   
   the thread on the spindle.   
      
                       ... P.   
      
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