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By nickelsilver · Posted
I straighten pivots like this routinely. Get the part running true in the lathe, not counting the pivot. Heat brass or nickel tweezers in alcohol lamp until you can barely hold them, and use them to coax into alignment. -
By ClaudioCavalli · Posted
Thank you ColdWind, I did try the alum solution and albeit slow (I am on my third bath of 6 hours at 70° C with a solution of 10ml of water and 2.5g of alum) it seems to be working. I can now screw in the new stem, at least a few turns. I expect that at some point I will be able to screw the stem in all the way. Perhaps next I will try a bigger bath. I wonder if the limited amount of alum is slowing down the process? An happy side effect of the alum bath is that it removed the oxidation from the crown!! claudio -
This will take some time. I need to do some reading and watch a video or two…Thank you for all the detailed help @nevenbekriev -
What size was the barrel as Bergeon do up to 19mm but they aren't cheap. In the past I've made some of my own using stainless tube and a suitable arbor from my set. Edit If I was making one again and had to buy the tube I'd go for brass. You'd need 3 tubes of reducing diameters and a couple of plastic disc for the pusher part as sketch below. -
By nevenbekriev · Posted
The brass and the copper too have some weak magnetic features. So very strong magnet will attract light brass hairspring pin, also brass shavings and similar. But, it is not worth to search for such pin when it has been pinged in earth orbit. OP, no need to unpin the spring. The entire stud is easily removed from the balance cock
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