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Just to refresh my memory why do we need calipers for bending the bridge? -
Are you certain the screw was not plated with nickel in the first place? Polishing the head may remove the plating and expose the steel to oxidizing while the rest of the screw is protected from oxidation. I have made this mistake... An unplated unpolished screw will turn blue but not look very nice. I agree about the container. It is much too big and acting as a heat sink. To get decent results I kept reducing my pan until I settled on a 3cm steel cup. At the end of this thread is what I ended up using over a flame. Not exactly useful on a hot plate though. https://www.watchrepairtalk.com/topic/30935-bluing-hands-with-a-spirit-lamp/#findComment-264421 -
I've found a few similar with this first one being the most similar. I think the second one answers your question about the stem tube. https://empress.cc/products/1920s-rueff-freres-lugrin-minute-repeater-18k-gold-swiss-pocket-watch -
The make do stem has a turned round shaft at the bottom, a little higher is the square but slightly tapered shaft, this fits in to the setting mechanism but only friction tight. The stem isn’t long enough to go right through the case so can only test and wind out of the case. In normal position the stem winds and if you push the hand setting lever (at 4 position) this separates the setting mechanism and the hands can be set, pushing the same lever back disengages it and it goes back in to the normal position. im unsure how the stem in this movement is prevented from dropping out, there are no threads in the crown shaft for a screwed sleeve. -
Yep…This makes perfect sense. With that large a gap in the serial numbers, they were almost certainly machined on different equipment, hence one should have no expectation of any cross-batch compatibility. I’ll revert to the original bridge. Regarding bending the bridge @nevenbekriev, I’ll give it a try, but I may have to buy some better calipers. My Vernier calipers are only accurate to 0.1mm. Not very accurate.
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