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Here's a top tip:
When collimating, only ever use two of the three screws. Mark one, and never touch it!
Why - because by fiddling with all three, you actually end up moving the mirror up and down the tube! Not so important for the Primary, that just changes the focus position, but very important for the secondary.
If your secondary has 4 screws like mine, well the same applies, use 3 fix 1, it's just a little more fiddly.
Oh and buy a paracorr NOW!
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