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By nevenbekriev · Posted
Did You correct this? Not needed to remove the enstone plate, just pressing down the regulator exactly where the arrow is enough, but first remove the balance and press while the cock is supported on something. The hairspring is not centered and what @nickelsilver said is the way to correct it, but the reason possibly is that the stud is placed turned in the hole and the screw tightened while the stud is not in correct orientation. Turning the stud clockwise if seen from above will help to center the spring It will be good if we can see a picture of the hairspring while balance over the cock -
yeah, that's a Hermle 340-020 movement (https://www.cousinsuk.com/product/hermle-340020-a). I have one here on my bench. -
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By nevenbekriev · Posted
OK, today I visited a friend who is watchmaker and asked him if he has useless old sapphire crystal. He took out one from an old Seiko Kinetic for parts and gave it to me. I came home and started work. The first I did was to break the crystal with the hope some small piece will have suitable shape to work on. For my surprise, appears there is thin (0.35mm) sapphire layer on top of a thick glass piece. I first was disappointed, as the stone I need is with diam 0.65mm (and then ground to half to obtain D cross-section) but then figured that it may be actually better for me. Realized that I can use one of the flat and polished faces as locking face of the jewel and thus there is still enough meat in thickness of the sapphire. So, I ground small rectangle piece and glued it with shellac on the side of a 0.6mm steel plate, then filed it round and lapped it to form the 'back' of the stone. I think the stone is good enough and will do the job it is meant for. I cleaned all the parts of the movement as there was gummed oil everywhere. The spring is very strong and it was challenge to get it wound while holding the barrel and collect it in the winder barrel to extract it. It left for tomorrow to test everything -
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