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Posted

I am getting close to completing a project watch, which I admit I bought somewhat on impulse and whim. It's a rotary chronospeed diver watch which was in need of a new module. Also, unfortunately the winding stem has sheared off flush in the crown - see photo below. I believe the winding stem is stainless steel, as is the crown, therefore alum solution will not work. The thread size on the stem drawing is marked as S0.9 (M0.9mm?). Are there any tricks or advise to remove the sheared off section of winding stem please? I look forward to your advice please. Regards deggsy

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Posted

Agree with OH, replacing the stem and crown would be the easiest, you could drill the stem out of the crown with the right tools...

Posted
Agree with OH, replacing the stem and crown would be the easiest, you could drill the stem out of the crown with the right tools...

Ok, I have found a potential solution! A guy I work with makes model trains and has a small electric lathe. He has offered to drill out the stem if I supply the drill bit. My plan is to drill 0.8mm first and see if I can rescue the m0.9 thread. If not, drill 0.9 and bond the stem (after length adjustment) into the crown with araldite resin.


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Posted
Just replace the stem and button.

I have a new stem, that's sorted out. The button is hard to find and rotary want as much as I paid for the watch [emoji51]


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Posted (edited)

Use Alum. (search it on the forum for details it's been talked about many times)
I would assume an attempt to drill out a stem would likely result in a ruined thread in the crown, rendering it unusable.

Edited by Ishima
Posted
Use Alum. (search it on the forum for details it's been talked about many times)
I would assume an attempt to drill out a stem would likely result in a ruined thread in the crown, rendering it unusable.

Hi Ishima. Thanks for you reply. I believe that the stem, unfortunately, is stainless steel like the crown. Alum as you know will only attack the interstices of ferrous steel, so in this case it will not work. If the thread is ruined I will just have to bond the stem into the crown. Not ideal / perfect repair but it will work fine. Epoxy is used commonly on aircraft for bonding metal components.

Regards deggsy


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Posted
Oh sorry, it appears i didn't read through your post.[emoji3]

Lol. That's ok! Thanks anyway


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