NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Maintenance of SNO-T's Was Re: on washing sextants
From: Courtney Thomas
Date: 2004 Aug 3, 22:00 -0500
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