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    R: Refilling Mk IXA Bubble Sextant
    From: Giuseppe Menga
    Date: 2004 Feb 26, 09:58 +0100

    I did the job for myself.
    These are the steps I followed:
    1) make sure the chamber is dry.
    2) open the soldering point and with a syringe fill on the hexane.
    3) the quantity is not critical (I filled up completely), however if you
    leave the
        hole open it will shortly evaporate a little bit.
    4) loading and unloading the diafram fill the visible chamber with liquid.
    5) then, reverse the sextant and load the diafram, just a little - the
    bobble will appear
    6) if the bubble is too big in the right position tilt the sextant so that
    the bubble         finish on the border at hour 10 (in the view your
    left-up) - you see a small dent     in the border  of the     chamber and
    release the diafram the bubble will             slowly disappear.
    7) if the bubble size is ok release the diafram with the bubble away from
    the dent     on the border
    8) when every thing is ok resold the hole.
    -----Messaggio Originale-----
    Da: "Zvi Doron" 
    Data invio: mercoled? 25 febbraio 2004 23.53
    Oggetto: Refilling Mk IXA Bubble Sextant
    > Hello,
    > Having found Steve Grobler's web page re restoration of the RAF Mk IX
    > sextant but having failed to communicate with him or with Robert Eno for a
    > copy of the PDF instructions they have, hand written  by the Australian
    > Frank Bartlett, could someone help?
    > I know how to get to the bubble chamber, I know where the soldered bit is,
    > know I need Hexane and I know I need to use a syringe. I do not know what
    > do exactly and in what ordr, and in particular how much liquid should go
    > How do I know that I have left enough air inside but not too much before
    > resoldering?
    > Thanks for any help or tips - the sextant otherwise is in great condition
    > and I am really keen to get it working.
    > Zvi

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