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    Re: C. Plath Sextants Mirror Adjustment
    From: Kieran Kelly
    Date: 2003 Sep 17, 16:06 +1000

    Mr Peterson,
    Thank you very much for your comments on the Plath Navistar Professional
    Sextant. I wonder if I could trouble you for come clarification as follows:
    Does the adjustment mechanism on the Plath Classic operate the same way as
    that on the Professional i.e. that you do not need to loosen one adjustment
    screw before the other is tightened?
    Also you wrote: The big issue with these mirrors is corrosion of the
    stainless steel screws in the aluminum mirror housing.  Frequently, if you
    can get the screws out the sockets, the
    holes require retapping and sometimes the corrosion is too great and must be
    drilled and tapped oversize for a new, larger screw.
    My sextants are used exclusively for dry land, mainly desert navigation. Am
    I likely to have the corrosion problem described? Does the Classic suffer
    from the corrosion problem as well as the Professional? Does keeping the
    screws oiled alleviate the problem?
    One final question: A watchmaker where I buy my sextant oil/grease said that
    a useful way to remove old grease from clocks is to use Shellite. Do you
    know if this is satisfactory and safe  for sextants?
    Many thanks
    Kieran Kelly
    6 David Place
    Seaforth 2092
    e mail kkelly---.net.au
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