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Thanks Paul,
Although the corrected Newtonian is as good optically as any RC or CDK, mechanically suffers from the fact that there is no easy way of aligning the mechanical axis of the focuser with the optical axis during construction.
Meanwhile I took advantage of the heatwave and printed the heater elements. Also I tested for secondary flexure by using a dummy secondary mirror made of scrap metal onto which I attached a small flat mirror. I used a crosshair target in front of the alignment telescope and focused on its reflection in the dummy secondary. There was no significant flexure going horizon to horizon.
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