Thank you raymo, it is to hold the focuser, if I tighten it the focuser will no move, must be for heavier EP or 2 inch EP.I will leave it alone.
Haven't tried the sight scope yet it's been 40C and don't want to cook the mirror or with thunderstorms around be struck by lightening- it is 2015.
Just taken with tablet to the east, sun shining on storm.
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Have been trying to construct a denver chair, as jupiter gave me a back ache, but worth it!
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Taken now tiny moon in the west.