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Hardest Repair to Date

jdrichard
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jdrichard Distinguished Member

jdrichard

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So it started with the purchase of this Hamilton 912.da053e496ada03fe047867d10c30482c.jpg

It had a loose balance and upon examination one of the pivots was broken. So off I went to eBay to order a 3050 balance staff. Three came in the mail.

I started by removing the hairspring from the balance and then removed the roller plate with Impulse Jewel and safe roller. 2ded6482cad2e37300638e6b03c49f86.jpg936926bbfe7f047bed59f23db34328ba.jpg

I then got out my roller remover and punched out the roller and safety roller.eb995bce56af5f2b42a8eb0038e75c85.jpg06cafdabc9ecb31ed469599e12ed87e2.jpg

Then I took the staff and balance and fit the balance and staff in my Staking set; flat arms on the balance flat against the Staking tools plate. I then got out my NEW staff remover.76d0cac733a4bf6ee48250a7eb87bb26.jpg

I then made a YouTube on how to use the tool.

After I punched out the old stake I staked in a new one56af9e7b17d68b304b037952bd7e3093.jpgc717746bf93a003f7e20940107fb4420.jpg

Did a good job. The next step was to put the double rollers back. That is when I noticed that the roller jewel was loose. I got out my combination tools and shellacked the jewel and tested that it was now in good. I then staked in the rollers and moved on the put the hairspring back on. I did so and noticed that the collet was cracked. I had another old Hamilton movement and started farting around with the two hairsprings. Need to use the older one so I cleaned in and installed in and put the balance back in.585bb1916ca480679c527fe9a028271e.jpg

Now the fun started. When I tightened down the balance cock the bottom pivot of the balance staff was too big ( my mistake) and it cracked the lower jewel. So I went into my collection of jewels and found and Illinois lower balance jewel that was the right hole size and also fit the opening. I installed it oiled in and screwed on the cap jewel. Reinstalled the balance and had to take it off again and take off the hairspring and straighten it a bit as it was touching the balance arm. So once I had in all in place I noticed that the balance was not down far enough to allow the upper pivot to extend into the jewel hole. So I took a slice of watch paper and wedged it into the back of the balance. Finally that did it and with a little work in the Banking Pins I was able to get a beat. About 200degree turn is all I could get, but I had no energy left to try and get more. A new crystal is now on order and the watch works fine. What a day.19b73ff7c68b77410bbc3c0da09debf9.jpgPaper jammed in.4cd92bb517c54283b4ee1369f0f06ca0.jpgHappybecf9e8f861de2dab8e05a57f8b54f5f.jpg

 

 

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    • ManSkirtBrew
      1972 Bulova President "E" Sea King 11ACACB movement

      By ManSkirtBrew · Posted

      Oh nice. I have a similar wedge style stump for my staking tool, so I'll give that a shot. Thanks!
    • joelcarvajal
      Gamblin Gamsol for cleaning?

      By joelcarvajal · Posted

      Thank you all for the replies!  Very informative! True enough, the Gamsol took some time to evaporate and does leave a residue. So not all naphtha are created equal!  Need to find alternatives then. i was able to try Hexane recommended by Alex and it seems great.  I wonder what the cons are?
    • GuyMontag
      1972 Bulova President "E" Sea King 11ACACB movement

      By GuyMontag · Posted

      Yeah, I saw that in the tech sheet but I don't see how it can be adequately cleaned with the friction pinion still in place. I've accidentally pulled the arbor right out of the wheel once when I used a presto tool to try and remove it. Mark shows how he does it with the Platax tool. Those are a little too pricey for me so I got one of these from Aliexpress and I just push down on the arbor with the end of my brass tweezers. That usually gets it most of the way out and then I just grab the wheel with one hand the and the friction pinion with the other and gently rotate them until it pops off. Probably not the best way but it's seemed to work for me so far.    
    • Zedster
      Movement inserted from crytal side

      By Zedster · Posted

      Thanks, Jon Sounds like a plan. Obviously I'll have the face on so do you think gripping with the holder will create any problems, but I will check in the morning to see how feasible it is but I assume it only needs to be lightly held. As for holding the movement instead of the holder won't be possible in this scenario as one hand will be puling on the stem while the other pushes the spring down. That was my initial concern is how the hell can I do this with only one pair of hands. All the other times I've had to remove the stem hasn't been a problem, apart from the force required to release the stem from the setting lever, but now I need to fit the face and hands its sent me into panic mode. If it had the screw type release things would be a lot simpler but that's life 😀   Another thing I will need to consider is once the dial and hands are fitted and the movement is sitting in the case I will need to turn it over to put the case screws in. I saw a vid on Wristwatch revival where he lightly fitted the crystal and bezel so he could turn it over, is this the only option or is there another method?      
    • nevenbekriev
      Main spring

      By nevenbekriev · Posted

      Hi Jon, do You think that relation spring torque - amplitude is linear? I would rather guess that the amplitude should be proportional to the square of the torque. I had once idea to check it, but still haven't.
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