Stem broken - can it be rescued?

[Khan]

Hi

I got a Jaeger LeCoultre K911 movement, where one of the stems was broken. Part no. Should be 401. 

Im based in Europe and tried Cousins but its discontinued. They except to get stem in stock for cal. K916 but will that work? Or Is there a way out to join the ends?

Edited April 28, 2024 by Khan

[RichardHarris123]

https://perrinwatchparts.com/products/jaeger-lecoultre-caliber-911-winding-stem-tap-120-measurement-58-110-smooth-shoulder-l-550-thread-l-420-with-addition-shoulder-before-thread

One here but it's from America, not sure what the shipping will be.  I don't think the 916 would fit, another problem is JL parts are restricted.  Only other option is to measure the stem and get a generic replacement. 

[watchweasol]

Hi   Find attached parts/repair notes for the JLC 911,  might be useful.

JLC_JLC 910, 911.pdf JLC_JLC 910, 911 Repair Notes.pdf

[Neverenoughwatches]

8 hours ago, Khan said:

Hi

I got a Jaeger LeCoultre K911 movement, where one of the stems was broken. Part no. Should be 401. 

Im based in Europe and tried Cousins but its discontinued. They except to get stem in stock for cal. K916 but will that work? Or Is there a way out to join the ends?

Not easy to find this one everywhere,  so it depends where you are located. Joining it back together might be possible, i have silver soldered mild steel before even with traditional plumbers lead and its a pretty strong joint, but bere in mind this is only 1mm diameter.  The join would need to be very accurate,  it not something i have heard of anyone trying before. The part no 401 is the swiss code number and relates to watch winding stems in general

[watchfellow]

I think that a 814/825 stem would work, there are a lot of compatible parts between these.

[Khan]

On 4/28/2024 at 9:42 PM, watchfellow said:

I think that a 814/825 stem would work, there are a lot of compatible parts between these.

I actually ordered a 489/916 stem at that works! Thanks for inspiration. 

Now the only challenge I have is that the alarm is not working unless I push down on the Lever (pointed with red arrow). There is resistance/elasticity in that lever hence its not sitting loose. Does anybody know these movements? 

Edited June 15, 2024 by Khan

[watchfellow]

The part you are pointing to is the disconnector. It's purpose is to stop the alarm from working unless one end slips through a space in the hour wheel/unlocking wheel at a certain point. I would try removing the hour wheel and unlocking wheel and make sure that the disconnector has proper play first. Without the unlocking wheel the alarm should work right away when wound as the disconnector will be free.