[quote=rmcpb;303963]Some steps for you:
- Loosen the three secondary screws enough to allow the secondary to pivot on the central bolt.
As squinty, mr snipey and rmcpb (above quote) say; just loosen the 3 secondary screws very slightly - this takes their "holding pressure" off of the secondary holder and allows the secondary to be rotated.
Sorry Bill, but you don't turn the centre bolt/screw to rotate the sec mirror: this seems to be an ongoing confusion for a number of people re its' functions. Whilst your caution to leinad about only "loosening" this centre bolt a bit to turn the sec does work, you are actually interfering with the sec's alignment under the focusser by doing so, and it is not the proper procedure.
This centre bolt/screw does not, in the ordinary sense of the word, "tighten" or "loosen" anything - unless you take it to the extremes of its travel either way - it is a spring tensioned "toggling" device that relies on the pressures of the 3 setscrews to "set" its tilt and to hold it in said position.
Its other function is to centre the secondary mirror (and its holder) under and concentric within the focusser tube view/position. If this is required you will need to unscrew those aformentioned 3 screws - but only if you need to "pull" the sec mirror and holder "up" the scope away from the primary mirror to centre it under the focusser.
To accomplish this (if necessary) you screw the centre bolt/screw clockwise: if you needed to move the sec mirror etc towards the primary you would turn the centre bolt anticlockwise and its spring tension would move the sec towards the primary. This of course would not impinge upon the 3 screws so they would not need slackening off initially.
If you need to perform this operation, as said, you would still need to pinch up the 3 screws to set and hold the sec's tilt afterwards.
Cheers, Darryl.