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    • By rduckwor
      Elgin 712/713 shock spring.  Does anyone know the name of this particular type of shock spring?  Thanks,

      RMD

    • By m1ks
      Hmmm, kind of!
      But........ It shows great potential as a hobbyist alternative, with some tweaking.
      After a back and forth with @Andyhull on another thread it got me to thinking perhaps it's not as useless as my initial annoyance led me to think, (I broke a mainspring trying it but to be fair the spring had been previously abused and the tool wasn't ideally sized allowing the coils to jump and tangle).
      I had a bit of a resize with sanding stick and scalpel and tried again and it's certainly got promise, I need to tweak the file to suit specific barrels but it's a simple quick 3 part print using barely any filament.
      Obviously not anywhere near as good as the proper bergeon winder but definitely cheaper for the hobbyist, (even if you haven't already got a printer and had to buy one first).
      Here's a video of it if anyone is interested, comments and ideas are welcome.
       
    • By Plusfoursmax
      Hi,
      I have a Rotary Monza I am fixing up. I disassembled the barrel and removed and cleaned the mainspring. I secured a copy of the parts list and it shows that as well as the mainspring, there is also a Brake Spring (part 775 on the picture). What is it, and do I really need it? Certainly Cousins does not sell it. I googled AS 1902 brake spring and ONE result came up of a Russian watch forum discussing this item. Apparently it is thicker than a normal spring and it seems to have some sort of bent over feature on it. Can I just make one using the old mainspring? If so, how long should it be? Is it really necessary?
      https://translate.google.com/translate?hl=en&sl=ru&u=http://forum.watch.ru/showthread.php%3Fp%3D5196915&prev=search
      ROTARY Monza AS 1902.pdf
    • By DouglasSkinner
      Recently replaced the mainspring in a vintage watch (a Westfield 7j).  Cleaned and lubricated watch.  Worked fine for several days.  Now I have a problem in which it stops before the mainspring is fully unwound--power reserve appears to be less than 24 hrs, but I haven't done a precise check.  Just noticed this morning that it was stopped at about 0530.  Prior to this the watch had good power reserve and the mainspring fully unwound--power reserve over 30 hrs.  What kinds of things might cause this?

    • By DouglasSkinner
      I have an ETA 2750 movement and I need to replace the mainspring.  My catalogs don't cover this caliber.  The current mainspring, based on my measurements has the dimensions Dennison (Metric), W: 5 1/2 (1.45 mm), T: 9 (0.13 mm), L: ~ 14 1/2" (368 mm).  However, due to its age and the fact that it's been serviced before I'm not completely sure the old spring is the correct one.  So my first question is are these the right dimensions for the proper mainspring for the 2750?
      My second question is does anybody know some part or catalog numbers for the correct mainspring by some different manufactures of springs, such as Marco, Nu Vigor, Sandsteel, etc.?  I have some cabinets of mainsprings from which I might be able to get one but I need to know the a catalog/part number--some number I can cross reference to what I have.  Hope this makes sense.  Thanks.
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    • Welcome to the forum.
    • Your original description reminded me of a recent problem I had with a different movement.  I switched screws.......The head on the screw holding the pallet cock turned out to look the same, but had a minutely thicker head.  This caught the balance and stopped it.  I felt really silly but it was a very rewarding fix!
    • If you didn't clean the balance jewels introducing fresh oil could dislodge the old gummed up oil and make things worse. I'm afraid you you wont make much progress without cleaning the balance jewels. Assuming you have checked that all jewels are clean and balance pivots are not bent bu the problem still persists,... I would check the endshake of the balance. A watch this old may have had the balance staff replaced and the replacement may not have been an exact fit. On most watches you can adjust the endshake a bit by pushing the jewel housing in the mainplate up or down a bit (using a staking set). Note that this may change the interface between roller jewel and pallet fork so this needs to be considered. On larger mens watches you can sometimes get a screwdriver between the hairspring coils to remove the jewels but on these smaller ladies watches its not so easy. Good luck Anilv
    • Hello all, Imnew to the group, been collecting for only a short time. saw Marks youtube vids, and gave a crack at the basic course. I've retired from the open heart team and very used to working with loops on mm objects. This subject of watchmaking has always interested me, but family and work always to precedence.
    • I have a Solution - Clear nail polish Find an inconspicuous spot then under magnification put a small drop on the tip of a pin and try to mix it into the plastic. If it polish changes colour you have your glue if not, let it set to see how well it adheres anyway. If above fails try another brand - nail polish is just a solution designed to dissolve shiny plastics an their additives.
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