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As I have mentioned, I have recently bought an A-12 bubble sextant.  I
have since refilled the bubble chamber with xylene and made a sun
shot.

However, I have a question: The sextant came with three plastic drums
to record measurements.  How do I take off a drum?

According to the user manual, it should be simple:

  "Lift the drum straight off the Sextant.  It will be noted that the
  drum is fitted to a flange which has three studs.  Two of these studs
  are small and long enough to extend through the operating drum.  The
  remaining stud is shorter and larger so that it is impossible to put
  the drum on in the wrong position"

However, I think my sextant has been assembled incorrectly.  I've
posted a picture here: http://jrv.oddones.org/A-12-drum.jpg.  In
addition to studs mentioned above, the drum has a slot and the shaft
has a key.  However, on my sextant, the key and slot are almost 180
degrees out of alignment.  The drum cannot be pulled directly out
because of the key, and cannot be rotated because of the studs.

I can see two possible ways to proceed.  The studs have slots,
suggesting I might remove them with a screwdriver.  I actually tried
that, but they didn't budge.  The other way would be to remove the
"spring lock" from the other end of the shaft.  I'm not sure that
would accomplish anything - the manual tells me to remove the spring
lock only after I "remove the three screws from the countershaft and
trigger bracket assembly".  However, the drum is covering those three
screws.

Any suggestions would be appreciated.

        - Jim Van Zandt

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