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Twisted Stem

Klassiker

By Klassiker
in Watch Repairs Help & Advice

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Klassiker Distinguished Member

Klassiker

Posted
Posted

I have just disassembled an ETA 2789 (at least that's what's marked under the balance. It doesn't have the day display) and found the square of the winding stem to be twisted. The function of the watch doesn't seem to be impaired. Winding and setting work fine. My question is, how can this happen? It's a seemingly perfect twist (no bend), and too much torque on the crown would surely cause breakage somewhere else before the square twists. So was it made that way? Why? I've never seen or heard of anything like it.

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Chopin Super WRT Addict

Chopin

Posted
Posted

Indeed this is one of those movements that uses a twisted stem... No worries.

Usually I've found these on ladies calibers... Never on men's but who knows...

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jdm Distinguished Member

jdm

Posted
Posted
5 minutes ago, Chopin said:

Usually I've found these on ladies calibers... Never on men's but who knows...

ETA 2824-1 is like that. I think the idea is that the twist helps the setting lever in keeping the castle wheel pressed.

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jdrichard Distinguished Member

jdrichard

Posted
Posted

My wife's Squale Diver had a twisted stem and when I cleaned and repaired it I thought I had to bend it back. Lucky I stopped to think.

Sent from my GT-N5110 using Tapatalk

  • 1 year later...
LittleWatchShop Distinguished Member

LittleWatchShop

Posted
Posted

I have a watch with a twisted stem.  Like others, I thought it was a problem.  After researching, I discovered that it was ok.  Searched the forum to find this thread which is helpful, but still scratching my head as to how a twisted stem makes things work better. 

In the worst-case scenario, could it be replaced with a straight stem?  Just curious...not an issue for me now.

Nucejoe Distinguished Member

Nucejoe

Posted
Posted
55 minutes ago, LittleWatchShop said:

but still scratching my head as to how a twisted stem makes things work better. 

The twist drives the winding and sliding pinions towards each other which enhances the grip for their clutch action. 

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LittleWatchShop Distinguished Member

LittleWatchShop

Posted
Posted
1 minute ago, Nucejoe said:

The twist drives the winding and sliding pinions towards each other which enhances the grip for their clutch action. 

Ahhhh...I see it now.  Blinding glimpse of the obvious!  Thanks!!

Nucejoe Distinguished Member

Nucejoe

Posted
Posted
Just now, LittleWatchShop said:

Ahhhh...I see it now.  Blinding glimpse of the obvious!  Thanks!!

I didn't say it quite right in previous post. Actually only the sliding pinion gets driven towards the winding pinion.

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