Most visitors online was 1990 , on 7 Feb 2022
Thank you both Skutt and Graham. There’s only the broken screw in the plate now. I have a double boiler going (glass pudding basin over a saucepan of water) with a tiny gas flame keeping it hot. I had a block of alum for stopping bleeding from shaving cuts. Screw remnant turned black quickly but it is going to take a while for it to fully dissolve.Alum should only be agressive to iron (steel) but I have had some other stuff that got discolored. Don't remember what it was but it was easily polished out.
Heating the solution will speed up the process. Cold solution may take a day or two. Just check that there is not a small bubble formed over the screw part.
If there are some other steel parts you can't easily remove from the plate you can cover them with wax.
I have one of the Indian ones. I’ll give it a go!Hi Stephen,
Balance screw holders with the sliding sleeve to close them are useful in placing these tiny screws, but the Bergeon ones are pretty expensive, (not sure about the Indian versions, very much cheaper, but the finish is probably inferior). I did make one myself once for this sort of job.
My first check would be that the hairspring and balance wheel moves freely in both positions. Is there some endshake? No touching of the balance wheel of the center wheel or the pallet cock/bridge, no hairspring touching the balance cock...... .Sometimes you can hear an odd sound if you listen closely......It swings well enough dial up but not dial down.
In my earlier post there was a bit of end shake. It's not measured, it was just I could feel it and see it as I lifted the balance wheel with tweezers whilst installed in the watch. I think at that stage the balance cock was not fully tightened down. I am always nervous about fully tightening down the balance cock screw if the balance will not oscillate freely because it usually means a pivot is not located properly. I took the balance off the cock (again) and checked the pivots. I don't have a caliper, only a vernier (which isn't very accurate). All I could do was compare the pivots with a known good balance by eye (the one running in the video in post #62). I could not see anything obvious wrong. I checked the endstone settings were screwed down properly -the dial side was not. I put the balance back and fully tightened the balance cock and it just would not swing for more than an oscillation or two dial down but will swing quite well dial up. I then got fed up with it and put the good balance from another movement in and that was fine so I put the pallets in and it ran well straight away.When you say insufficient end shake how is that measured? You had some end shake as per your post #61. That should be enough. Specially since the watch runs Dial Up.
Have you tried the balance in the donor movement you transplanted the functioning balance from? Do you have a caliper? If so measure the diameter of the balance pivots. This may indicate any mushoroming......
How is the end shake with the transplanted balance?