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    Re: Kollsman Periscopic Bubble Adjust
    From: Gary LaPook
    Date: 2019 Aug 7, 04:50 -0700

    Well, it looked brand new to me. I didn't reallize they were putting the new props on old birds. I have Kollsman periscopics, MA-1, MA-2, A-10 and A-7. I like the A-7 the most for inflight use, it is the lightest and the eyepiece can be swiveled so that you can look off to the side easily without turning your head, I have taken many sights with it from my plane and also on three atlantic crossings from a passenger seat on an airliner. Second to it is the MA-2, it is heavier but the averager is great. 

    See:  https://www.youtube.com/watch?v=usfDty3pWso

       
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