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From: Courtney Thomas (no email)
Date: Tue Aug 03 2004 - 23:00:52 EDT
Lee,
Thank you for your clarifications as my CHO-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 CHO-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 CHO-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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