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    Sextant AN 5851-1
    From: Peter Henry
    Date: 2004 Jun 3, 00:22 -0400

    I have a Navy Mark V (AN 5851-1) sextant which I purchased last winter and
    have been using occasional.  When I purchased the sextant it had not been
    used for a very long time I removed all of the housing and cleaned it in
    it's entirety.  The bubble on recite was very large and unadjustable but
    with the replacement of the o ring at the thimble pressure pump and
    persistent attempts at using it I was able to get the bubble to adjust from
    large to small and back.  I would also like to note that since I a have
    received the instrument I has had a distinct sent which could be the bubble
    fluid and that the I have stored it with this loose per a note typed on a
    piece of paper in the box which reads as follows. " Important, Always return
    bubble control nut to neutral when not using the instrument. (nut should
    spin freely) Leaving pressure on diaphragm damages bubble unit beyond
    repair."
    
    Recently I took the unit out of it's case for the first time in a month and
    the bubble is back to it's large size and I am not able to reduce it.  I am
    wondering of the fluid needs to be refilled. If so what is the fluid and
    where does one get the fluid and how is refilling it accomplished?  Is the
    diaphragm damaged? If it is how can I repair or replace it?  I would greatly
    appreciate any questions and assistance that one might give me.
    
    Sincerely,
    
    Peter Henry
    
    
    

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