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    Re: Maintenance of SNO-T's Was Re: on washing sextants
    From: Courtney Thomas
    Date: 2004 Aug 3, 22:00 -0500

    Lee,
    
    Thank you for your clarifications as my SNO-T is like yours but I got no
    manual or brush with mine.
    
    Also, there was an empty vial that I assume once had lubricant. I have
    read Jojoba oil is the way to go on this. Comment ?
    
    And....what do you think of the RainX suggestion for the mirrors ?
    
    Cordially,
    
    Courtney
    
    
    
    Lee Martin wrote:
    
    > Joel, I am not so sure about some of your suggestions, my comments below.
    >
    > ----- Original Message -----
    > From: "Joel Jacobs" 
    > To: 
    > Sent: Wednesday, August 04, 2004 2:56 AM
    > Subject: Re: on washing sextants
    >
    >
    >
    >>Courtney,
    >>
    >
    >   Sometimes it pays to
    >
    >>remove the aft leg which will allow the index arm to move backwards off
    >>
    > the
    >
    >>arc. There maybe some kind of a stop which has to be removed.
    >>
    >
    > On my 1988 SNO-T the index arm sits within the frame and it is impossible to
    > move it off the arc.
    >
    >
    >  Take the index
    >
    >>arm and move it all the way to the back of the arc. In a SNO-T the
    >>
    > underside
    >
    >>of the cylinder in which the tangent screw is housed has a slot which is
    >>wide enough to see the teeth of the screw.
    >>
    >
    > Not on my SNO-T...the drum completely "seals" the tangent screw in all
    > positions of the index arm. It is clear that is the purpose of the
    > design....the drum completely encloses the tangent screw and the drum fits
    > snugly on the arc, all to prevent the ingress of dirt. The only way to get
    > at the tangent screw is to unscrew the 3 screws holding the drum onto the
    > index arm, and remove the drum....something I would not want to do often.
    >
    > I have always found a RTFM to be a useful thing to do when these sorts of
    > questions arise. In this case, the SNO-T manual suggests the only
    > maintenance necessary is a careful brushing of the arc after each use (brush
    > supplied) to remove all particles of grit and salt. And a very occasional
    > lubrication of the arc with the lubricant supplied (no idea what it is).
    > Clearly, any but the lightest lubrication will pick up grit and salt......I
    > have never lubricated mine, prefering to rely on stringent cleanliness. It
    > seems to me that one would only access the tangent screw or internals of the
    > drum when normal maintenance had failed, or wasn't carried out at all.
    > Trying to wash the drum in situ on the arm doesn't seem very useful to me,
    > because there is no way to flush water in and out of the drum, to carry the
    > dirt and salt away.
    >
    > The manual has nothing to say about preserving the eyecups. I have used
    > occasional talc, which I suspect is what was placed on them in the
    > factory.In any case, I suspect the eyecups might be relatively easy to
    > replace at a camera/binocular store.
    >
    > Lee Martin
    >
    >
    >>----- Original Message -----
    >>From: "Courtney Thomas" 
    >>To: 
    >>Sent: Tuesday, August 03, 2004 10:52 AM
    >>Subject: Re: on washing sextants
    >>
    >>
    >>
    >>>Joel,
    >>>
    >>>I have a SNO-T with the barrel enclosed tangent screw.
    >>>
    >>>How do I properly gain access to the tangent screw ?
    >>>
    >>>Also, what should be done to preserve rubber eye cup pliability ?
    >>>
    >>>Appreciatively,
    >>>
    >>>Courtney
    >>>
    >
    
    
    --
    s/v Mutiny
    Rhodes Bounty II
    lying Oriental, NC
    WDB5619
    
    
    

       
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