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Damien,
The best way to check your colimnation is with a star test.
Find a star field and bring it in and out of focus.
You will find the stars 'bloat' and form..
Doughnuts.
This is the shadow from your secondary mirror.
If the hole is in the center of the star doughnut..
the scope is in, or close to colmination.
See attached images for reference.
Some images are from a newtonian but the
principle is the same.
Note how the holes in the doughnuts are off center
This is out of collimination.
Paul.
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