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Cannot Remove Eta 955.112 Movement From Hamilton 8102 Case.


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Hi, I have a Hamilton quartz watch case # 8102 with a ETA 955.112 movement and I am having trouble getting the movement out so I can clean the case. There is an outer ring that is either brass or gold plated steel and there are two screws near the outer edge opposite each other that I removed thinking they were holding the movement to the outer ring. I have removed the crown and the movement will not budge and I am afraid of breaking it. If you are familiar with this set up could you tell me how to remove it? I believe that outer ring needs to come out but it does not move. Thank you for any help you can give. post-369-0-30285800-1458599724_thumb.jpg

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I had already considered that it might be a front loader but It has a flat crystal so I thought it had to be like a Longines I have where the crystal needs to be removed to take the movement out but now I see that it looks like the bezel is removable so I will try it and get back to you. (Also I did try rotating the ring thinking it might unscrew).

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    • I loved his explanation of a teardown 😅
    • I also see a bit of danger for the wheel, at least you have to keep away from it and may get a too thick rest ring. My rest rings are about 0.05 mm. Better way would be a grinding wheel touching the staff with its circumference. Frank
    • Not easy to find this one everywhere,  so it depends where you are located. Joining it back together might be possible, i have silver soldered mild steel before even with traditional plumbers lead and its a pretty strong joint, but bere in mind this is only 1mm diameter.  The join would need to be very accurate,  it not something i have heard of anyone trying before. The part no 401 is the swiss code number and relates to watch winding stems in general
    • Thanks everyone for your helpful replies. I think between us we’ve worked out what’s going on. Next job is to have a proper look at this great wheel assembly, see if I can remove the clip and the friction fit pinion, give the bits a good clean, then put it back together with a bit of blue grease. I’ll also get the pallet fork under the microscope to see if it’s ok or been damaged. 
    • The cannon pinion (be it conventional style or what you see in this movement) should slip on its arbour so the hands can be set independently without affecting the gear train.  If there is too much friction between the cannon pinion and the second wheel, turning the hands to set them backwards can sometimes force the escape wheel teeth to overrun the pallet stones, creating the behaviour you describe. The train is running in reverse when this happens.  This can often chip the pallet stones. I’d say at least half of the watches I’ve inspected with very tight cannon pinions had chipped pallet stones. Hopefully this isn’t the case with your watch.  I’m not familiar with this movement but you need to get the friction in the cannon pinion adjusted correctly.  Hope this helps, Mark
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