Waltham 365

[Murks]

Hi have another question I'm still working on this waltham 365 first a notice the balance wheel was not moving freely so a decided to adjust both the jewels the upper and the lower still a can't get a proper end shake and side shake a checked both the jewels to see if the both have the end shake and side shakes the both fit  well and seem ok and right hole size  perfect a can't ad just any more of it in case both the upper and the lower jewels come out the movement a purchase this balance staff on cousinuk my question is can it be possibly that a need to shorten pivots if that's the case should a do the lower pivot first or the upper this is a balance pivot? Also on that picture going to see that a had taken out the jewels out the movement just to see if the issue where the jewels.

[RichardHarris123]

Are you sure that it's the correct balance staff? 

[AndyGSi]

What part have you got from Cousins as I didn't think they sold anything for the 365?

[Murks]

It a waltham 361 model 1907 the balance staff  number is : 20208 the one a had purchase on cousinuk. Cab someone check if that's right? 

[AndyGSi]

Info here shows a 20207 or 20208 but can't confirm what the difference is between them apart from the obvious description.

Edit

They do appear the same size so looks like it is just the shoulder that's different.

How does the new compare with the old?

20207

20208

 

Edited June 27, 2024 by AndyGSi

[Murks]

A don't have the old staff anymore the original one the one a had purchased of cousinuk is this one I'm not sure if that's the same

[AndyGSi]

Does that mean you've thrown the old staff away?

[Murks]

Yes a throw the old staff away a didn't reliase

[AndyGSi]

I presume you've not even got any photos of the old staff?

[JohnR725]

3 minutes ago, Murks said:

Yes a throw the old staff away a didn't reliase

 

14 hours ago, AndyGSi said:

How does the new compare with the old?

Extremely important when replacing balance staffs to have detailed measurements of the old staff to verify with detailed measurements of new staff to make sure they're actually the same staff. As you've discovered classically with American pocket watches for the most part almost all balance staffs will have variation in pivots size and other times still have other dimensional differences all with the exact same part number.

Typical with Waltham lots and lots of variations. Looks like it is the 20208 Balance staff. But ideally it would've been nice to have the original to measure to see what dimensions are not quite right because oftentimes even aftermarket staffs will have variations which is why it's nice to keep the old balance staff.

Then if I go look at the staff table in the book as was pointed out up above and as usual there are pivots size variations. Which is probably why your staff does not fit the jewels as you have the wrong size pivots.

[AndyGSi]

Can you measure the pivot size on your new staff and the jewel hole size?

[Murks]

OK Andy will do