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praezis last won the day on September 29 2018

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About praezis

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  1. All good traditional practice. However in such cases I take some coordinates with a microscope, make a CAD drawing and have the part laser cut. Frank
  2. Finally this is your tool for hands setting. Frank
  3. No urban legend in this case, John. The person attended WOSTEP in Switzerland and said, he learned the method there and its how the Swiss do it... I have it, too, but nearly never use it. It doesn't work with higher sitting wheels. Luckily the tool takes little space in the drawer Frank
  4. I use it for that task, too. There is someone in US who claims, the Swiss use to remove these wheels by hand, twisting it, while the gears are blocked. And shall be the 'one and only' method! Can you confirm this? Frank
  5. An old Witschi catalog from supposed early 50s. It has many funny timing machines from the era. Catched it years ago on the Chaux-de-Fonds museum fair. Frank
  6. This tool was sold as "tool for filing balance screws". Hence the "unknown" pin. Funny that the tool is still made with that pin without knowing its reason . I had searched some time for # 30673 until I found mine. I use it rarely but I am happy I have it when I need it. Frank
  7. I would do as Nickelsilver recommended: adapt the screw. A basis and strict rule in watchmaking is: never alter the original movement parts, but adapt the replacement part to fit! Frank
  8. No hand presses! They are tools for turning/opening shock protection springs. Frank
  9. Yes, universal key for key-wound pocket watches. Not very reliable working. Frank
  10. If you turn away the hub or use a Molfres to grind it away, both are the same preserving methods of removing a staff. I suppose they never saw the picture below or don't care. On discussion with such a pro in US who insisted in punching staffs out - said this is taught by WOSTEP - , I sacrificed a valuable NOS balance wheel (I have plenty of). It shows, not just the rivet but the staff body, too, is distorted by rivetting. Frank
  11. @VWatchie Seems some videos produce more questions than answers - compared to reading books by proven expert authors (the old fashioned way, I know). To your initial question: Dynamic poising is to be handled with care. Conclusions are valid only, if the watch is in perfect technical condition! The mentioned watch differs by more than 50 degrees in those two vertical positions. Here the rate difference can come from isochrone effects (rate dependent on amplitude) - in that case, poise conclusions are not valid at all! Also a TM amplitude measurement can be unreliable, the real li
  12. Hi, you can do as proposed by AshF, but a slight bend at the marked spot will center your hairspring: It will move the collet at right angle to the line spot - hs center. Why do you suppose an original non-shock? How does the jewel in the plate look like? Frank
  13. Before someone is running into traps, please study that picture. It shows the influence of a heavy spot below at different amplitude. As you can see, influence is zero at about 220 degrees, and it changes from fast to slow under and over 220 deg.! Not at all . Frank
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