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    Re: Kollsman periscopic sextant mount
    From: David Pike
    Date: 2016 Nov 29, 15:16 -0800

    Actually, now I come to think about it, I don’t think I need to buy anything new after all.  I’ve got six 4BA machine screws with matching nuts.  If I pick six equi-spaced holes with plenty of space below them, I can use the 4BA screws and back up behind with 4BA nuts.  Then it doesn’t matter if they’re 38.48 TPI and a bit wobbly. The nuts will stop any chance of the mounting plus sextant coming tumbling down.  DaveP

    Probably 8-32. Nom dia is .164”, and most screws are sized slightly smaller than that.  Paul Dolkas

     

       
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