The later alarm trip assemblies - the one in which the cam on the trip staff is a steel disc with a cutout, and the trip wheel is steel with a stamped out projection - can be troublesome. I had so much trouble with these parts on a 1970 Big Ben leg model reproduction that I replaced them with the old style trip assembly having the brass finger on the trip staff and a brass trip wheel. This solved the problem of the trip staff being carried around with the trip wheel.
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