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Re: Ebay kollsman periscope sextants
From: UNK
Date: 2018 Jun 7, 07:01 -0700

Hi Paul,
I tried the BB/ball bearing level several years ago and it didn’t work. As someone pointed out, there’s microscopic resistance to getting the ball rolling.

http://fer3.com/arc/m2.aspx/How-not-level-an-AH-Wilson-jan-2014-g26645

Regards, Noell

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