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Interesting idea about the template paper circle. How do you actually do the "spotting" without letting the paper touch the mirror surface? Also, I'd prefer a "ring" shape (spot with a hole in it) instead of a filled circle, so that I could still use my return-beam laser collimator (which itself needs collimation!).
When collimating with the laser I noticed I could see the light from the laser on the back of the mirror. That should work the other way too. So maybe I could stick the paper template on the back of the mirror and shine the laser through the hole in the paper to show me where the centre is on the coated side.
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