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I use the catseye Infinity autocollimator and Blackcat system for my R200SS. They do a kit that includes a Cheshire for aligning the edge of the secondary with the focuser drawtube. The Infinity autocollimator and Blackcat require a center spot sticker to be applied to the primary but it comes with a template to lay over the mirror to get it centered. Works fantastic, very highly recommended for fast newts. I bought the Baader 4-in-1 2" compression ring with the M60 thread to suit the 2" autocollimator. Just make sure you get the correct length catseye XLKP autocollimator such that the autocollimator mirror ends up at the focal plane.
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