Re: [ATM] Flat grinding the back of the primary mirror

["Bob May" <bobmay@nethere.com>]

You can use almost anything to grind on the back.  A piece of
steel, aluminum or a large tile or even a somewhat flat stone.
Window glass in the thinner thicknesses (under a half inch
thickness) will tend to flex and not make a decent flat surface.
Bob May
bobmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net
Replace the obvious words with the proper character.

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