Lost dial lock screw - 10K large dials

There seems to be some confusion here. The brass slug I was talking about is tightened between the bottom of the thumbscrew and the cross feed or compound lead screw. Where it goes on the lathe is in an area where there are NO threads - the jam area is just a smooth part of one of the lead screws. When tightened, simple friction prevents the dial from turning freely.
 
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