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Newtonian Secondary
Purchase my first Newtonian (Orion UK VX10" f4.8) a while back and it came with the secondary removed for safe transport. I am fitting the secondary to the spider holder with a M5 centre screw. The three collimation screws are M4 I think. Question is how far do you screw down the centre mounting screw, obviously the secondary must pivot on this screw in order for the collimation screws to take effect. How stable is this and will it hold collimation. Has anyone put a short spring between the secondary holder and the spider mount to put tension on the centre screw?
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