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>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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