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i use a combo of Laser and cheshire. it was only in recent times i figured the ceshire is a very powerful little tool.....
of course it can nail your secondary / primary alignment. but it can do more than that. when looking though the sight tube you can see a few things. the Primary spot, the Cheshire spot (Primary mirror alignment) then you can see the outer ring of the sight tube (cheshire) this will give the secondary rotation as if it isn't perpendicular to your cheshire you wont see a clean ring it will be like your looking at a cylinder skewed(you can see down the sides of the tube) with this in mind you can adjust.
As for the Secondary offset, this is kind of easy depending on the scope you have aperature wise. <8" put the primary mirror spot in the middle of the secondary. 8"> adjust it slightly to the lower part say 35 - 40% from the bottom. that is done by adjusting the spider.
With my experience with SW gear, don't expect it to be "aligned from factory" because it isn't!!! most of my screws where loose and they had tightened the secondary screws to the point they ate into the secondary stalk making the secondary alignment impossible.
the other thing is don't be affraid of pulling it down.! its not that hard. and theres really nothing that you can really stuff up... apart from dropping something on the primary!
1. "The angle of the dangle" getting the secondary to point to the middle of the primary.
2. the angle of the primary (aligning the primary to the secondary and hence the center of the Focuser draw tube.
3. Rotation of the secondary.
Like i say nowdays, look at what the light cone is doing once you figure this out then youll be on the road to success.!
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