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    Re: sextant for use on land
    From: Robert Eno
    Date: 2006 Sep 10, 17:44 -0500

    On the subject of odd tools, my advice to anyone who intends to dismantle or
    otherwise tamper with the mechanical components of a bubble sextant ensure
    that they have the proper tools for doing so. There is a temptation to use
    the "approximate" tool, however -- and this is based on bitter personal
    experience -- no good can come of it. The result is, at worst, a ruined
    instrument or component. At best a chewed up fastener that can no longer be
    used. Just try to find a replacement nowadays. Good luck.

    Living where I do, finding the right tool is more often than not, a futile
    effort. I was fortunate in that I had a good friend who is a machinist. A
    damn good one at that. He fabricated a number of specialty tools for me and
    specifically tools for dismantling my Plath bubble attachment. Regrettably,
    he has long since left town so I am without a machinist.

    To all budding tamperers out there: befriend a machinist or at least
    cultivate a friendly relationship with one. With the proper tools and a
    little bit of intelligence, any job can be accomplished.

    And Red: yes, you are being cynical but I share your cynicism. All too
    often, I am finding that mechanical contrivances require specialized tools
    only sold by the company that manufactures the item and at ridiculously
    inflated costs. I won't name names but one such company comes to mind: they
    are based in Sweden, and produce marine diesel engines. A friend of mine
    from the USA calls them "green alters" because the parts cost a fortune. I
    should add that they are good engines but damn costly to maintain. Anyway, I
    had to order an injector puller from them. Cost me $75.00 and guess what?
    The damn thing disintegrated and didn't even pull the injector. I had a
    mechanic friend (and machinist) who works as one of the XXXXX dealers in
    Newfoundland fabricate a proper puller for me -- for free.  Worked like a
    charm.

    Hexane can be obtained from any lab supply company. The stuff is sold by the
    quart, if I am not mistaken. I have lots of it due to the nature of my work
    and the fact that liaise with a lot of researchers who end up with surplus
    chemicals at the end of their field seasons. Not that I take everything on
    offer! Just the stuff I can use.

    Robert


    ----- Original Message -----
    From: "Red" <hellosailor@verizon.net>
    To: <NavList@fer3.com>
    Sent: Sunday, September 10, 2006 5:42 PM
    Subject: [NavList 1263] Re: sextant for use on land


    >
    > James, Home Depot usually stocks Xylene in pint cans. The stock varies but
    > if
    > yours doesn't have it hidden someplace, try any other paint shop or auto
    > body/paint supply. I think I paid $4? for a pint last year, and know it
    > came
    > from a Home Depot.
    >
    > I'd never seen or heard of a "Bristol Spline Wrench" until this post and
    > I'm
    > familiar with a number of odd tools. I guess there's always one more. The
    > Bristol Wrench Company (holders of the patent<G>) are online and their
    > explanation of the special properties of the design makes sense, but I
    > suspect
    > proper metallurgy and design allow a conventional Allen (hex) stud to
    > replace
    > it.
    >
    > Color me cynical but I'd swear the real purpose of that B.S.W. fitting is
    > a
    > tamper-proofing design, with no practical purpose for the individual
    > owner. A
    > way to keep "the other" aviation mechanics from refilling the bubble with
    > incorrect fluids, and damaging the sextants, perhaps.
    >
    >
    > >


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