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Problem solved! Many thanks to Bill Morris and Ken Gebhart. Ken walked
me through the issue - turns out that the small ball bearing with the
hole under the bubble control nut had turned so that the hole was no
longer aligned.
Mark

On Feb 18, 1:36�pm,  wrote:
> G'day Mark
>
> I assume you have an air bubble cell. Just to check, the left hand side of 
the instrument should be up and the tubular air chamber horizontal while you 
tap the bubble control button repeatedly (AN 5851). You could also try 
swinging the instrument rapidly around at arms length with the LHS facing you
>
> I have recently covered refilling the bubble unit and overhauling it in a 
blog on my website atwww.sextantbooks.com�Look under "Aircraft sextants."
>
> Bill Morris
> Pukenui
> New Zealand.
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