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Posted

Hello Forum

I am very new to this hobby, but I am leaning.  I have an old Wenger Swiss Military watch that I believe is model 7900x.  I would like to put a new crystal in it, but I am not able to remove the stem.  Can anyone provide advice on how to remove it.

Thank you very much.Tim

 

Wenger Watch.jpg

Posted

if you look carefully you should see a tab which you depress .and then pull out the stem. while i am not familiar with this exact movement, my first guess would be that reddish dot.

Posted

Hi On theplate at the opposite end to the crystal there is a logo and most likly a number  From what I can make out its a ebauches  may be FHF  or FHS.   Can you post what they are or get a clear picture of the same please.

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    • Hello Tom and welcome to the forum.
    • Hah! Well, California will have to do. Lived in TX for a brief period back in the early 70s, though, so maybe that counts. 🙂 Funny you should mention making vacuum tubes- I've actually tinkered with that! It's REALLY tough to do, and I've never made one more complicated than a simple diode that barely worked, but I have played around at it. But there's just no infrastructure for vacuum tube fabrication. I can get a lathe and learn how to use it to make complex parts, and while it might take a while to learn- and money to get the equipment, of course- it is possible to do more or less "off the shelf". But vacuum tubes, not so much. There are a few folks out there doing some crazy cool work with bespoke tubes, but they have setups that are far beyond what I can manage in my environment and it's mostly stuff they built by hand. I also have been playing with making piezoelectric Rochelle Salt crystals to replace ancient vacuum tube turntable needles- nobody's made those commercially for probably 60 years. I'm a sucker for learning how to do weird things no one does any more so I can make things no one uses work again. (I think this is drifting off the topic of lathes, lol).
    • You shoulda been born in Texas. Tough to make a vacuum tube though. You can substitute with a MOSFET eq ckt I guess. I was playing around making a pinion the other day. More to it than meets the eye.
    • Well, turns out it was a fake bezel! The crystal is domed mineral glass and I was able to find a cheap replacement that should be here in two days.  I used my crappy little press to pop out the cracked crystal, Ill give the case a good cleaning in the meantime and do a once over on the movement.     
    • Early ‘90s Debenhams in Oxford Street at InTime Watch Repairs. The older guy was one of my mentors Mr John Campfield, fantastic ex-Omega watchmaker. Good times - black hair gone now! 😄
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