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    Re: A-8A Aircraft Sextant
    From: Chris Caswell
    Date: 2017 Sep 10, 07:14 -0700

    Hi Michael,

    I have managed to get my bubble unit functioning, but the seal for the top lens was falling apart and leaking, so I removed it. In it's place, I used a thick shellac (made from flakes and denatured alcohol) to seal the glass, and today will see if it holds. I also was able to clean both top and bottom lenses.

    Bendix used radioactive paint on the bubble lens (Ra226, I believe) and it is still quite hot, and removing it is not advisable, so I would store the A8-A say, in the basement up high and away from areas used by people.

    As far as your bubble unit is concerned, I would wash out the fluid area and see if the diaphragm is still working - on mine,  the limit screw on the drive wheel was not allowing the cap to contact the diaphragm, so once I adjusted that, I could produce and remove a bubble.

    You can contact me by email at:  olayers@sover.net

    Chris in VT




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