Age old question for all reflector owners

[Vermin (Tom)]

The Howie Glatter laser I possess seems to hold it's axial alignment exceptionally well, but good point none the less.

It's pretty easy to test by rotating the laser in the focuser and checking if the return beam moves.

[Roger Davis]

The Cheshire (no crosshairs) will determine any rotation of your secondary.
The Sight tube (crosshairs) will determine axial tilt of your secondary, it will also aid in the collimation if you have a four vane spider.
The Autocollimator will set your whole system as close to a star test as is possible.
The star test will be the final tweak to get it spot on.