I'm almost able to do this in my sleep now.
How many times have I had the balance off to chase down the beat error?
Four?
Five?

Something like that, with a good day and a half wait between to get the power down.

Now I hope I'm getting closer, balance back in and running nicely. Amplitude isn't huge (around 200º) but I expected that due to age, mainspring etc.



Next step, onto the Timegrapher to see the result.

 

Well the last check looked "OK" considering the age/condition of the movement and I think if I keep chasing for a perfect beat error I introduce the risk of doing something wrong every time I pull the balance apart.


It's not perfect, and an experienced watchmaker could probably get it a bit better with some hairspring manipulation but as I'm not skilled in this delicate area, it's going to be what it is. If it was my watch, or even if it was something like a Seiko 7S26 I'd probably persist, it would be much easier to find a new/used hairspring for one but my chances of sourcing one for this movement are slim to say the least.

A wise man knows when to step back from the edge (should have done that 7 pages ago ).

A final Timegrapher check shows some gain, rather even traces and a beat error of 0.5ms.



Now it's on to the winder for a few days to ensure it keeps time and the autowinder is working properly.

 

Getting there Jim

 

Very nice!!!!!!

 

I have found odd quirks with aftermarket Rolex crystals.
It hasn't been so much the crystal as it has been the case/bezel itself. Tiny variations in tolerances?

I had 3x Tudor Rolex oyster cases that all required an exceptional amount of wd40 + pressure on the crystal press. No kidding I cracked 3-4 various aftermarket ones trying to get them on.

Then the last 5-6 Rolex and Tudor's that I have done for myself/friends have taken G-S or Sternkreuz Tropic crystals without any problems.
Hmmmmm..

I nearly resorted to sanding a bit on a particular finicky Tropic 12 crystal - eventually found a Italian brand that worked with that case.

I do know what I'm doing most of the time, I really wonder what was happening at the time.

 

The time has come. All finished and ready to go home.



Darn, still got glare/reflections .
Back to photo school for me.

 

Looks good Jim, very moody

 

Errr, ummmmmm.............................. oh yeah!

That's the look I was going for!

 

Nice work!!!

 

So very nice, so much that I want one. But after this thread, I also really DON'T want one....

Great job!

 

Well, not all the Tudor Subs have difficult movements like this one does...



Mine has a much easier movement to deal with...



They are pretty great watches. Mine was issued to a Ship's Diver in the Canadian Navy.

Cheers, Al

 

Oh, Totally, I meant specifically this 7928. I 100% plan on grabbing a Tudor sub someday. Nothing sweeter than the smell of a small rose.

 

Hi Al, what movement are you referring to?

thanks,

fred

 

The difficult one is what this thread is about, and the not so difficult one is in my watch...

 

Yes, my apologies for the confusion. My inquiry is on yours,

 

Are you asking what the movement is? If so...



ETA 2776.

 

Yes, thank you

 

Some good Tudor info here