Longines moon phase chronograph balance wheel stopped

[cduke]

6 hours ago, Klassiker said:

Well done! Most likely not a case screw through, and now missing from its proper place in the movement.

That’s what you’d think but in fact it was a case screw just above the escapement wheel on the perimeter and I popped it in.

No screws missing this time!

[Jon]

Well done!

[cduke]

1 hour ago, Jon said:

Well done!

Thanks for all your help and advice Jon.  I am not ashamed to say "if you can't be good, at least be lucky".  This applies for me in this case.  Thankfully, Longines was in no rush to send me the repair packaging which made me even more desperate and  therefore adventurous!

[KOwatch]

@nickelsilver or someone else, can you describe the tools and procedure for checking screw torque in a movement?

I've never seen or used a torque wrench smaller than about 20cm in length,  there must be watch-delicate torque screwdrivers.

When we torque bolts, it's our standard procedure to mark the bolts so we know they are torqued. Are torqued movement screws not marked because that would marr the jewelry, or because these are non-critical components, and because the customer pays for the consequences? This problem should only happen once ever, then the manufacturer puts into place procedures to prevent the problem in the future.

 

I guess it's these "dynometric torque cylinders"?

https://www.cousinsuk.com/product/screwdriver-dynometric-torque-cylinders

 

Not cheap at all! and you have to buy a different one for each torque setting, yikes

Edited April 17, 2021 by KOwatch
more info

[Nucejoe]

Looking at them prices, I'll stick to my dynometric wrist.