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Thanks for the interest so far chaps. I should have said that I went through the taps that I have at the outset.
Its larger than 1/2 BSW and thread is finer. Also larger than 1/4 BSP.
I've managed to self tap a bit of delrin rod in and out and the pitch is bang on 1.5mm (17tpi).
bearing in mind these were made circa 1990 (?) is it M14 x 1.5 ?
Steve.
Last edited by steve medlock; 06-10-2021 at 05:45 PM.
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