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Jean-Philippe,

> Just spray a little WD40 inside the enclosed worm after
> each cruise and you'll never have any issue

You mean though the gap between the arc and the worm enclosure?
How can you sprey anything through such a small gap?

> As for sand and dust in a desert region,
> I don't think it (nor any other marine sextant btw) was designed for
> this very specific use.

Of course. But with an open worm you see the dirt on it, and with
a closed one you dont. For example my last horizon alt oservation
was on a sand beach. And I worried, about this
sand, though we observed with Bill's Astra.

> I also own a SNO-M but it's less accurate
> than the SNO-T and also far less confortable to handle.

Yes, all Russian manuals and text books mention that SNO-M is
less accurate,

> The thumb rest
> featured on the back of the SNO-T is really ergonomic

I agree. Do you know by chance what is the rectangular cavity
in the back of the handle for?
Just to decrease its weight?

I thought, perhaps they planned some electric illumination attachment?
The magnifier is great, but luminiscent illumination is too weak
for twilights.
One can use it, of course, for a little notepad to record the
observations.
One can make one, even with a pencil holder.

Alex.

   

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