Mainspring interchangeability

Discussion in 'Watch Repair' started by sandlapper, Feb 11, 2019.

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  1. sandlapper

    sandlapper Registered User

    May 20, 2018
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    Fellows, can anyone tell me if there is a substitute for a Hamilton #232 mainspring for a M-940 Motor barrel, as I have the watch torn down, and mistakenly thought I had a replacement spring for it? Is there an interchangeability list for mainsprings somewhere I might download? Thanks, Marcus
     
  2. Dave Coatsworth

    Dave Coatsworth Forums Administrator
    NAWCC Business Sponsor

    Feb 11, 2005
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    Hi Sandlapper,
    I'm going to move your post to the Repair forum where I think it will do better.

    Oddly enough, given the popularity of the model, the #232 has never been manufactured in alloy (at least to my knowledge). The spring is 3.18 wide. Kind of an odd size. I'm not aware of anything that would substitute. We seem to be running out of the original blue steel springs.
     
  3. sandlapper

    sandlapper Registered User

    May 20, 2018
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    Dave, Thanks for the information. Strange that no alloy spring has been offered for that model as they made a bazillion of them. Marcus
     

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