[ATM] Source for Cassegrain secondary blank?

["Jeff Bottman" <jeff.bottman@gmail.com>]

Greetings all,

I have made a few Newtonian telescopes, including the mirrors, and have
settled on a 10 inch Dall-Kirkham Cassegrain as a very interesting next
project. (To be used for planet/moon imaging)

Does anyone know of a good source for pyrex blanks in the range 2 to 3
inches, for the secondary? I would actually need 2, for the purpose of
fringe testing to assure sphericity.

Thanks,
Jeff Bottman
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