Original Handwheel Washer (stop motion clamp washer) for all black, tan and many white Featherweights*.  Washers with part number 45930 or 45716 are interchangeable.  To remove the handwheel, you will need to unscrew the on the stop-back motion knob first.  Slip the new handwheel washer on with the notches facing out, then replace the hand wheel and stop-back motion knob.

*Some white Featherweights have a larger sized stop motion knob with a 9/16" threaded post.  (All black, tan and most white Featherweights have a 1/2" threaded post.)  This washer will only work if the threaded post measures 1/2".  Please  if you need a larger washer.