A question of trimming down?

Hello all,

I have a Parks 12.5" mirror that can give wonderful planetary views. However, it is 2" thick--thus taking awhile to come to thermal equilibrium even with active cooling. I was wondering whether anyone has ever heard of grinding the backend of an existing mirror down to decrease its thickness? I wager that minor concerns like cracking or scratching the top surface prohibit such an idea, but I thought I would ask.

Thanks

Don't do it. Grinding the back could very likely destroy the front figure.

A simple piece of glass is more complicated than it seems.