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Originally Posted by Midee (Mike)
My suggestion would be to ask IIS/Google if others know how to add a donut to an RC secondary
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I know there are stencils/paterns available online for primary mirrors which simplify the task. Simply print them out.
I'm sure a similar thing would exist for secondary mirrors too. I'll have a look later.
EDIT: That's my ignorance, there appears to be no such beast because it's not just the physical centre of a secondary mirror.
Apparently there's a book which may explain the mathematical process of spotting a secondary, I saw both positive and negative mention of it in various Cloudy Night threads relating to secondary mirror centres.
The Dobsonian Telescope by Kreige and Berry