Re: [ATM] 8 inch gregorian mirror

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

The usual stroke should do just fine.  As you surmized, the
center does need to be depressed but it may come to mate after
polishing begins as the motion will keep it from getting  too
high.  In other words, you need to start with a depressed section
but that depression doesn't need to be really deep.
Bob May
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