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Correct tap for flat-foot Speedy crown

  1. dbane007

    dbane007 Sep 7, 2017

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    By chance, can anyone confirm the correct tap size for early-mid 60's speedy crowns? I'm pretty sure diameter is 1.1mm, but what about the pitch? Would a M1.1x0.25 tap sound correct? TIA
     
  2. dbane007

    dbane007 Sep 7, 2017

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    oops.. I mean 1.0mm stem.. so would a M1.0x0.25 tap be correct?
     
  3. Timelab

    Timelab Sep 7, 2017

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    Yes, as far as I know all 321 and 861 movements use thread 1.00 stems.
     
    marco likes this.