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Lawren5

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About Lawren5

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    Watch Enthusiast

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    Washington State

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  1. Lawren5

    Shimming the Balance Cock

    I shimmed the balance cock with a strip of mylar .05mm thick but there was too much end shake. I then tried a strip of aluminum foil .02mm thick which was just right.
  2. Lawren5

    Shimming the Balance Cock

    I removed the balance jewels thinking that whoever serviced the watch before may have inadvertently swapped the upper and lower jewels but the lower set had a slightly larger diameter so they could not be swapped. It did appear that one of the lower jewels was installed backwards so I reversed it. This made a big difference in that the timegrapher line cleaned up and variations in both amplitude and rate were reduced when placing the watch in different positions. Still, I had to back off the balance cock screw about an eighth of a turn otherwise it slowed down the balance wheel. I don't know if the balance staff is original or not but don't want to take the chance of shortening and possibly damaging the pivots. At this point, I'm tempted to go with the shim as the watch performs well once the balance cock is raised slightly. In my original post I misidentified the movement as a Hamilton 992B when in fact it's a 999P.
  3. Lawren5

    Shimming the Balance Cock

    Yankeedog - Good point about the service record. I suspect that the watch may have been serviced before as I had to replace the mainspring and the correct Hamilton one was several centimeters shorter than the one I replaced. It could be that the balance jewels got swapped in the previous repair. Well, I guess there's only one way to find out.
  4. Lawren5

    Shimming the Balance Cock

    When you say "see if the balance is round and flat", what part are you referring to?
  5. I just serviced a Ball pocket watch with a Hamilton 992B movement. Prior to servicing, the balance wheel would not self start and the amplitude was at best 130 degrees when running. After servicing, the watch did not run any better until I loosened the balance cock screw just slightly which then allowed the balance to self start and the amplitude to jump to 210 degrees. The balance pivots look fine and I was careful not to mix up the top and bottom balance jewels. Given that everything else looked good, is shimming the balance cock an acceptable procedure and if so what is used as a shim?
  6. Lawren5

    Mainspring Sizing

    Thanks, John. I appreciate your comments. The thicker part of the lid extends almost to the edge so it would be a problem. I'll order the 534 because I know it will fit.
  7. Lawren5

    Mainspring Sizing

    It didn't look like there was additional room in the barrel. Also, the barrel cover is thicker in the middle than it is on the edge so it would almost certainly make contact with a 3.0 mm mainspring.
  8. Lawren5

    Mainspring Sizing

    I don't think the 534B will work because it has a width of 3.0mm whereas the broken mainspring measured 2.82 mm. The 534-718047 with a 2.80mm width is the one I've been considering and should work if the shorter length is not a problem.
  9. Lawren5

    Mainspring Sizing

    I need to find a replacement mainspring for a Ball pocket watch which uses the Hamilton 992B movement. The broken mainspring measures 2.82 mm wide, 0.16 mm thick/strength and 23.5 inches long. The closest replacement I can find has all the right specifications except that it is only 20.75 inches long, nearly 3 inches shorter. Would using a short mainspring present any problems?
  10. Lawren5

    Elgin Pocket Watch Stem Sleeve

    Thanks for the link, oldhippy. I contacted Dave and he's got something that should work. Will let you know once it arrives.
  11. Lawren5

    Elgin Pocket Watch Stem Sleeve

    Thanks, I'd appreciate that. I attached a drawing if that helps any.
  12. Lawren5

    Elgin Pocket Watch Stem Sleeve

    I just got off the phone with Ofrei but they said they only have what's listed on the page.
  13. Lawren5

    Elgin Pocket Watch Stem Sleeve

    I had looked at Ofrei but it's all threaded sleeves and no 12s sizes. I'm guessing that the reason the sleeve is not threaded is that the bow is fixed and therefore a sleeve removal tool could not access it.
  14. I'm working on an Elgin 12s pocket watch with a broken sleeve in the stem assembly. It appears to be unique in that it has no threads while all other sleeves I've come across have threaded ends similar to that in the second photo. I don't believe this sleeve was part of a threaded assembly because the case appears to have a soldered tube in place of where a threaded sleeve would normally attach (third photo). Since I’m unable to find a direct replacement sleeve, are there any other options available? This watch belonged to my grandfather so I’d really like to get it working again.
  15. Lawren5

    Strange Oscillation in Balance

    Further examination revealed the escape wheel to have a bent pivot as shown in the photo. From what I've read in another WRT post, attempts at bending pivots back into position presents a high risk of breakage.
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