Technos by Sheffield

Thread: Technos by Sheffield

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  1. #1
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    Technos by Sheffield

    This sat for a while as I tried with no luck to find another FHF 72 movement for parts, it needed a mainspring. Well last nite I got tired of seeing it sitting there staring at me with those sad puppy dog eyes and decided to try a generic swap.
    I have had several stripped down movements for parts from several months ago and ripped apart a barrel from the bin.
    took just a few minutes to rewind the new spring onto the original barrel
    and sure enough it was a good fit, it was just a bit longer than the original with a different end termination but the arbor did fit well locking into the notch with no slop or slack. It will take about 40 winds which seems like a good average and I am checking for duration to see if it makes 35+ hours like I think it should. Not a direct replacement but it works great keeping excellent time. Note: handwinding a mainspring works best from the out to in.
    Can't seem to nail down the year, maybe someone here can.
    Attached Images Attached Images

    2018 Blacklist Custom Unitas 6498 Conversion
    1977 Timex Milspec Custom ETA 2824 Conversion
    1969 Benrus US Military Issued
    1966 Timex 600 Skindiver
    1961 Belforte Sheppard AFB
    1961 Omega Seamaster



    "Time spent waiting between the seconds is only conspiring to make me older" DV 2018
    "I don't always agree with everybody but when I do it's because I'm Right"
    DV 2011
    Dirtvictim The Watch Mechanic.

  2. #2
    Member AbslomRob's Avatar
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    Re: Technos by Sheffield

    There's about a hundred watches that use the same size/type of mainspring as the FHF 72...Jules Borel sells it for $10, but they list all the other calibers that use the same size. If I were you, I'd try to get the right one; differences in width can cause the spring to rub against the barrel, and differences in thickness can affect the amplitude of the balance.
    My growing collection of "affordable" vintages: http://www.abslomrob.com

  3. #3
    Zenith Forum Co-moderator
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    Re: Technos by Sheffield

    Quote Originally Posted by AbslomRob View Post
    ...and differences in thickness can affect the amplitude of the balance.
    ...and knocking the banking from too strong a mainspring is definitely something to avoid!! (Shattered transmission stones are rather more difficult to replace).

    Hartmut Richter

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  5. #4
    Member
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    Re: Technos by Sheffield

    It is running well keeping great time. I will seek the correct spring in the future.
    2018 Blacklist Custom Unitas 6498 Conversion
    1977 Timex Milspec Custom ETA 2824 Conversion
    1969 Benrus US Military Issued
    1966 Timex 600 Skindiver
    1961 Belforte Sheppard AFB
    1961 Omega Seamaster



    "Time spent waiting between the seconds is only conspiring to make me older" DV 2018
    "I don't always agree with everybody but when I do it's because I'm Right"
    DV 2011
    Dirtvictim The Watch Mechanic.

  6. #5
    Member Beau8's Avatar
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    Re: Technos by Sheffield

    Glad to hear about the successful repair~Cheers!

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