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HI DSB,
Dont buy the cheshire at that price, Bintel or Andrews have the same for cheaper, I only have a Cheshire one and its fine, I then fine tune using a star outside in the dark. Wind out the focuser until you can see the secondary shadow in the middle of the star's blob and this will show you if the primary is spot on. Adjust MINUTELY mind you, the primary until the secondary shadow is in the middle of the star's circle. Once you adjust it, check at focus and see if everything is clear and repeat if necessary.
Therefore, my advice is, use a 35mm film canister (free) with a TINY hole in it for visual checking of the mirror alignments, fine tune with the star test, and WAIT until you can get a cheaper cheshire or laser from Andrews.
Chris
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