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Unknown Chronograph Calibre Valjoux 71



balance staff broken

lower balance jewel broken; cap missing




setting lever spring broken off

broken balance staff



















the crown wheel is rusted in and doesn't move any more




broken mainspring










the little washer doesn't belong here, and will probably have been put there to "resolve" an underlying problem ...




broken setting lever spring




the broken lower balance jewel

the new lower balance jewel

the new jewel in the jewel press

new jewel in place

testing the new balance staff

removing the old balance staff in the Platax tool


new staff riveted in











the safety pin does not sit correctly, leading to the impulse pin ending up on the wrong side of the palellet fork

position of safely pin corrected






the pusher slips by the start/stop lever as it's not wide enough

brass collet soldered to the start/stop lever to widen its tip



start/stop pusher in action

finally working!