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A good idea for first timers in collimating a newtonian is to keep a record of movement..the amount of partial turns per adjustment screw..(A..B..C) on either the Primary or Secondary..eg..A 1/4 out...B 1/8th in...C 0...just in case is doesn't work you can reverse the right screw without guesswork..saves a bit of grief!...and for goodness sake don't tighten the screws too much!!!...a tad more than finger tight should suffice!
Cheers!
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