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Basic watchmaking tips - crystal fitting

  1. Archer Omega Qualified Watchmaker Apr 8, 2024

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    Both - you want a very slight interference fit (approx. 0.02 mm) between the inside of the seal and the outside of the crystal.
     
  2. Lancaster Apr 28, 2024

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    I only know that one of them used the incorrect gasket, which I'd given him. See my post above.
     
  3. BLOW UP May 2, 2024

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    Hi, this is a really great resource, thank you A for collating it!
    Does anyone have any advice on fitting a NOS crystal to SM300 165.024, please?
    I've not done a 165. before. I was planning on removing the old one with my Bergeon 4266, but should the new one be fitted with the same
    using the pre-depth platform? Would this cause the tension ring to pop out?
    Or should it be fitted by using my basic levered Crystal Press?
    Or is it none of the above?
     
  4. rendo May 2, 2024

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    I don't think you are supposed to use the 4266 on a crystal with a tension ring. You will likely damage the replacement crystal, and also not be able to install it successfully. The claws won't be able to reduce the diameter of the crystal due to the tension ring pushing against it.

    You would need to press it out and in using a regular press.
     
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  5. BLOW UP May 2, 2024

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    Hi, thank you
    I thought that might be an issue fitting the new crystal, but you seem to be saying I should remove the old crystal by using a press,
    and fit the new one by using a press?
    Would a basic press do it, or should it be a specific kind of press?
    Cheers!
     
  6. Archer Omega Qualified Watchmaker May 2, 2024

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    Yes, they press in, so they press out. Alternately, you can knock the crystal out, but you would need to protect it if you plan to use it again.
     
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  7. BLOW UP May 2, 2024

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    Ok, got it!
    Yeah, I think it's worth keeping the old Crystal intact just in case there's an emergency or I can't get another for a while.
    Cheers!