Since it is in the shank/flange, look for a loose rep lever upstop (drop) screw, a drop of CA fixes that. Other sources of noise at let off: A hard cushion at the end of the rep lever, under cut with a narrowed-down Exacto blade. This releases the hard bond and reduces noise upon upstop screw contact. The end of the rep spring is binding within the jack. -- Regards, Jon Page
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