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The slip clutch is operated by pushing the pendulum leader (see illustration 1) slightly past the point where you feel a resistance. There is a slip clutch mechanism in the clock's escapement (the part that makes the ticking sound and operates the pendulum).
HERMLE 340 020 MANUAL SERIES
Note: these clocks usually have Hermle 131 Series Movement Instructions for Hermle Mechanical Mantel Clock with and hour and half hour strike and a pendulum Make only a small adjustment each time (about 1/16 of a turn). To make clock go slower: turn screw counterclockwise.
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