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I'm with Ed,
I did actually grind a 6" as a teenager, but unless it is really what you want to do, I would forget it. (just my $0.02cents worth though).
To my mind you are better off buying an optical set, perhaps an 8" or 10" and constructing the rest.
As Ed said, Bintel seem to sell them, as do a company called Antler (or whatever) Optics, they advertise on the Gecko Optical group.
Gary
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