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Old 26-05-2017, 11:52 AM
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bojan
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Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 6,016
MTO has a screw that protrudes inside and serves as focus stop, I only needed to remove it (and replace it with short one so dust doesn't go inside.

It is similar with yours....
http://www.strickling.net/russentonne.htm

BTW, when you dismantle (unscrew) the back end, do it carefully and slowly.... the lens will behave like expanding bellows, and it will "suck in" a lot of air and dust with it.
I think you only have to remove the screw (indicated on attached image I borrowed from webpage mentioned earlier).

If you do not plan to remove the main mirror, there are no "traps"... except those small screws (careful - they like to split where the slot is) but if I were you I would try to relax the mirror. It may not help a lot (depending on mirror shape precision and stress), but it will not hurt either.
Have a look at my thread below:
http://www.iceinspace.com.au/forum/s...&highlight=MTO
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Last edited by bojan; 26-05-2017 at 02:32 PM.
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