[BC]

I’m mucking around with all possible adjustments in the name of getting things just right. I’ve noticed that the Crayford focuser appears to have a mounting radius suited to an 8”, rather than my 10”. This means it only contacts the tube along 2 lines, rather than a surface contact. I don’t have a camera, so I’ve drawn a little pic. The reason I’m looking closely at this is that the focuser is not square to the tube, but is pointing over to one side (a bit). Lots of collimating documents talk about shimming the focuser to square it up, this is going to look pretty dodgy with a strip of something sticking out. Is this mounting arrangement normal on the 10” scope?

One tiny mod I did was to put a rubber band (still looking for the right sized O-ring) around the top of the main focuser shaft. This cushions the BANG when I’ve backed off the tension screw too much and the weight of a 2” EP is too much for it.