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Russell
Go to the following sites for Collimating a Newtonian
Astrobaby
Starizona
Both are excellent and details full of pictures and details
Centre screw of the secondary mirror only holds the mirror mount in place whilst the 3 outside screws do the adjusting of the secondary
Always align your secondary 1st with Cheshire eye piece and Primary mirror last with laser
Tweet secondary if needed with laser
Martin
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