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    Re: Refilling Mk IXA Bubble Sextant - Lessons Learnt
    From: Jared Sherman
    Date: 2004 Mar 6, 06:50 -0500

    Never having tried this, much less having held a bubble sextant, I only
    throw this out for speculation.
    
    The sextant be positioned so the solder-filled tube is horizontal?
    
    And since the solder was applied molten, can one assume it can be remelted
    without damaging the sextant?
    
    It should then be possible to remelt the solder and use "desoldering braid"
    also called "solder wick" to absorb the old solder out of the tube, removing
    it completely without any damage to the sextant or any contamination falling
    into the chamber.
    
    Desoldering braid is sold at most electronics repair vendors, along with the
    soldering irons and solder. It looks like braided metal wire, somthing like
    candle wicking or shoe lace made of very thin wires and chemically treated
    so it attracts and holds molten solder that it contacts. It is used and then
    thrown away as it "fills". Simply contacting it to the molten solder should
    be enough to "suck" the solder out of the tube.
    
    If anyone is doing this and then resoldering to close the tube, note that
    "silver solder" generally has a lower melting point than conventional
    lead-tin solder, and probably would be the better choice as it would allow
    less heat to be used.
    
    
    

       
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