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I brought a Saxon 10" Dob a few years ago and after assembling the base (smear some silicone on the bare edges, allow to dry, then put it together!) I checked the Primary and Secondary Mirror cells...the Primary mirror clips needed to be loosened off and retightened until they just touch the mirrors edge..the secondary was fine..next came the focuser which was squared in nicely but the rack and pinion had the taffy grease cleaned out and replaced with a quality waterproof type..an adjustment of the tension via the 4 screws underneath made for a smoother action.
The Secondary mirror has the offset configured in it's cell so once the spider is centred all that's needed is to check that the tube is straight and squared at each end...(you could use an old 1200mm fluro tube for this)
I know it's a lot to check but the careful mechanical alignment of the optical tube helps sort out any errors caused by rough handling during transport etc..
For collimation I use a longtube Chershire followed by a laser..which needs a pocket mirror to see the return beam hit it's source..after that it only needs a slight tweek after setting up..
Cheers!
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