ATM 16" blank thickness extended question

[brauch <a.brauch@okay.net>]

Dear list,

the decison desribed in my first post to the list has become even more difficult. I can 
get a thin pyrex blank cheaper than the   7:1 and 6:1 ratio DURAN blanks. Therefore my 
question is now, how much is the increase of effort and the risk to end with a not so 
good mirror when using thin instead of thick material ?

Thank you very much agian for your comments.

Clear skies !

Ilko