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Posted

Having fitted a new balance staff to an Omega 26.5T3, I found that the balance is a lot out of poise. 

I have a couple of tools which make countersink holes in to screw heads - but they look untidy and don't want to do that. 

So I've decided to buy a slotting screw head file, but don't know which one. Cousin's have them listed as 'Cut 2' to 'Cut 8' (the finest),

https://www.cousinsuk.com/product/slotting-screw-head-1850-vallorbe-swiss

Could someone please suggest the most appropriate file ?

 

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Posted

Definitely the finest, but I don't think currently available ones are really fine enough. Unless you're dealing with a truly valuable and rare piece it's really ok to take some material from the center of the head.

Posted

When slotted balances are out of poise, you should also consider bent balance halves. Your slots look as if they are of different width.

Frank

  • Like 1
Posted
30 minutes ago, praezis said:

When slotted balances are out of poise, you should also consider bent balance halves. Your slots look as if they are of different width.

Frank

I hadn't spotted that. It's heavy opposite the impulse jewel, and the slot does look a bit wider on that side.

I managed to find sizes of slotting files on the Vallorbe website. The finest listed is "cut 8",  = 0.35 mm, much too big for these screws.

Some of the screws have already been cut. I might be able to swap some round to get closet to balance.



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