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  • I think I need 3/8"

    You need a thread pitch gauge, you can't reliably tell ⅜" threads from 10mm just by measuring the major diameter, and ⅜" could be 24TPI or 26TPI

  • Thanks for flagging that.

    Looks like I'm going to have to go into the loft to find the thread gauge in my tap set.

    Aliexpress has 3/8" but then you're also rolling the dice on the seller's description.

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