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Hi Darryl,
Thanks for the instructions, I have tried all this, but I have a slight discrepancy with what you have suggested as I have a secondary 2x barlow built in between the Secondary mirror and the primary mirror and this is held in by a sheath that shrouds the secondary mirror and basically passes behind the secondary and stops me from putting my hand in and holding the secondary while I tighten it all up.
The reason its there is because its a catadioptric short tube newt (500mm tube with 1000mm FL) so this is probably another reason for me to take to it with a baseball bat?
I have managed to get the secondary centred and round once when I first did the collimation but now try to line it up just back of centre so that when I turn the allen key screws the mirror tilts up towards the focuser tube and lines up nice and central. Unfortunately this is a hit and miss affair - hence the burred screw head as I have done it over and over and over and over.
I have even taken the secondary vane housing off from the end of the tube and adjusted it in my lap so that I can line up the secondary as close as I "think" is central to to opening of the shroud where the focuser should be once reassembled. After this, I put the secondary vane housing back on and what do you know, its NOWHERE near centred when looking down the cheshire.
I think I might take up tiddlywinks, its less stressful.
Chris
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