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I concur that 8" is a better choice - fits the hands better - and if you are careful 3/4" glass from the local glass merchant is fine . It is usually pretty well annealed . A second disc say 1/2" with ceramic tiles epoxied on makes a good grinding tool . F8 would be a good choice .
Obviously with coating costs at around $200 and that you can get a finished Chinese mirror for $250 - you are in it for the pleasure of viewing the sky with an optics fashioned with your own hand !
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