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    Sextant Project
    From: Greg Rudzinski
    Date: 2008 Mar 28, 15:31 -0700

         Last year I set out to locate a Plath sextant that could provide
    parts for my U.S. Navy MK 3 M.Low. Daily watching of Ebay finally
    produced a Plath which was not functioning according to the owner.
    Upon receiving the Plath it became immediately apparent that this
    instrument was too good to cannibalize even though the sextant looked
    like it had spent the night with the Sampsonite Luggage gorilla. The
    first order of business was to completely disassemble the sextant then
    soak the arc in ammonia. Scrubbing the arc with an old toothbrush
    removed all the built-up corrosion. The mirrors and filters only
    needed a wipe down with alcohol. No saving the 4x40mm scope so the
    lenses were removed to create a sight tube. No saving the lighting
    system either.  Everything went back together as it came apart.
    Working the micrometer drum through the entire arc repeatedly with
    light oil helped to smooth out the operation of all the moving parts.
    A last touch was to strap on a digital watch to the sight tube with 24
    hr. GMT displayed. Finally I was off to the beach for calibration and
    testing. Observed LOP intercepts were within 3 nautical miles GPS .
    This instrument has now become my traveling small craft sextant and
    sees more action than my three other sextants combined.
    Lesson learned- One sextant project in hand is worth two on Ebay.
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