Replica watches: Replica Franck Muller watches manual-winding ...
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This work is known as berçage or rounding-off.Always a technical challenge, it consists in filing the tips of the arms with perfect regularity in order to give them a

Watch Repair - Escapements
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There is no guard pin, but, instead, the upper part of the lever is filed up to form a dart. When these escapements require the dart advancing to make the action

dard = dart or guard pin

http://www.horlogerie-suisse.com/Echappement/Chap2.htm

http://www.jaeger-lecoultre.com/FR/fr/dictionary.html?resolu...
Dard:
Minuscule composant horloger, le dard est placé sous l'ancre. Il protège l'échappement de la montre en cas de choc violent. Le dard du Calibre Jaeger-LeCoultre 101 pèse 0.00017 gramme.

Guard-pin or dart:
This small metal pin is located beneath the lever and serves to protect the watch escapement from violent impacts. The dart of Jaeger-LeCoultre Calibre 101 weighs just 0.00017 grams.

http://www.timezone.com/library/horologium/horologium6316731...