OK! So, I think the reason my collimation was off was due to the secondary not being square underneath the focuser. So, I've adjusted the focuser and all was looking good! However, the collimation was slightly off, so I took out the good ol' Astrosystems laser collimator, and the laser was about 3mm off centre. I do the usual, start undoing the 3 set screws, then start adjusting the collimation screws...but nada!! That mirror just won't move...no matter what I do, the laser stays in the same spot! ???
So, I did the unthinkable! I pulled the primary mirror straight off!! I've taken some pics and attached them below.
I read that the larger screws were for collimation, and the smaller screws were set screws, to hold the collimation in place. Is that right? If so, they why is this mirror not moving when I tighten either of them???
Help!
Thanks guys!