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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Kollsman MA-2 bubble sextant, bubble repair
From: Harold Boersma
Date: 2023 Nov 25, 08:04 -0800
From: Harold Boersma
Date: 2023 Nov 25, 08:04 -0800
In addition to your manual, I would like to report that I have managed to fill the reservoir with more bubble fluid (0.65 Centistroke (CST) Silicone oil). I did this by removing the increase bubble button and also the brackets that it is screwed to. then tighten the bellows as far as possible (carefully and not very stiffly), then squirt a very small amount of oil into the reservoir until there is a very small ball of liquid on the opening of the reservoir, then loosen the bellows a little. so that it actually sucks in the liquid. I got quite a lot of liquid in that way. then first closed the reservoir and then re-tightened the increase button.
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