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How To Service A Quartz Watch Eta 955.412


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This video shows how to safely strip a quartz watch movement to pieces and in the second video, how to re-assemble it.For these videos I am using an ETA 955.412 movement which is very popular in medium to high grade watches.

This watch is a Maurice Lacroix but you will find this movement in watches such as Rotary and Tag Heuer as well.

It is important to take your time and use quality, well maintained, tweezers and screwdrivers to do this job.

You need to be especially careful when removing the circuit board.

As with most watches it is advisable to start by removing the dial, calendar and motion work from the watch before removing the train wheels.

Needless to say, you should not put the circuit or any of the plastic parts through the cleaning machine as these will get damaged.

Also it is not advisable to put any of the magnetic parts through the cleaner as these will attract tiny metallic particles in the cleaning solutions. Simply clean them by hand using watch de-greaser and rodico.

This video is in two parts - enjoy.

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Yes - it can be worthwhile servicing these higher grade quartz movements. But if we are talking about a Miyota 2035 for example then that would be different as they only cost a few pounds to purchase new.

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    • Just a note for those who come searching for information on this topic in the future.  I did eventually find the Mark's video on how to replace these springs, as someone observed, he does in fact make the replacement look easy.  (It actually is relatively easy once you have the knack of it.) If you're enrolled in one of Mark's online courses, the demonstration of how to replace this spring is in the Bonus Videos section of his course site, and is called "C2B1 – Sea-Gull Style Shock Springs".
    • If the metal was twice as thick, it wouldn't snap so easily.  The thickness is governed by the space available so you can't use thicker metal.  If you glued two pieces together, the likelihood of snapping would be reduced.  That's my theory anyway, could be wrong. 
    • there are various approaches to learning watch repair. A lot of people want to jump right in and every single watches something to be repaired restored. But other times like this it's disposable it's here for you to learn and when you're through learning you throw it away. yes you definitely should try this you have a learning movement you need to learn and the best way to learn is by doing something.
    • Sorry, the friction will be so great that the wheel will barely turn, if the movement will start at all, the amplitude will be verry lo.
    • If I can’t re-pivot the wheel, the logical thing to do is to descend the pivot hole.  Plan is to either stick a suitably sized hole jewel (from a barrel bridge or something) or fashion a blob of epoxy on the underside of the escape wheel cock so the wheel sits on its one pivot on the base plate and the staff with the broken off pivot (which I’ll polish as best as I can) becomes the upper pivot. As long as it doesn’t foul the 4th wheel it should work? I know it’s a bodge job, and if this were a rare movement, or belonged to someone else I would not do this. I’m just interested to see if I can get the thing to run. 
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