Quote:
Originally Posted by jeff65
.......Also, I've heard that the marks worn into the back of the secondary holder by the screws can prevent you from getting the right degree of rotation.
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Absolutely! Very common on the GSO secondary mirror holders. I had some left over teflon bearing pads from earlier dob days. I made up three small pads, drilled a little indentation to take the screw heads and put those in place. Now I have smooth movement back and forwards in the correct direction for each of the three secondary adjustment screws. (They have only fallen out once - when the scope fell over and hit the ground!)