Hamilton 987-E Balance End Stone

[les13]

This appears to be an end stone, but I do not see how to oil it. The lower jewel can be oiled before installing the balance. What should I do with the upper?

 

[Klassiker]

You need to release the stud, that's the triangular piece, by loosening the screw, bottom right. Then you can remove the balance from the cock and clean and oil the jewels from the other side. There may even be screw heads there, to allow disassembly.

[Marc]

You might also want to have a look at the hair spring geometry to see if you can get it a bit more concentric.

[Tudor]

I think the top pivot is out of the jewel in the top and pulling the hairspring to one side. But, I agree, if it looks like that when assembled, you have to address that.

[Marc]

25 minutes ago, Tudor said:

I think the top pivot is out of the jewel in the top and pulling the hairspring to one side.

Very true, I think also the angle of the shot may make things look out of shape when they're not.

[Nucejoe]

I pull the regulator arm too, without seeing underneath you wouldn't know, then if tg tells you something is wrong, you pretty well end up overhaulihg twice.

Do it right, Do it once.

[les13]

When I first pulled the balance I noticed the hairspring was not centered. I ran the whole piece over the demagnetizer, but there was no change. I will disassemble, as advised, and oil the jewel and see if I can improve the hairspring.

Thanks everyone for the help.