Hi Trent
Be aware that cutting a hole will release stresses in the glass and ruin the figure on the mirror you have. It will need to be re- figured at the very least.
If you go ahead, I would recommend diamond tipped hole saws. I got some from eBay a few years ago. They work well and are inexpensive, just use plenty of water.
It's easy to to take a chunk of glass out on the rear side as the bit comes through so cut to within a short distance of one one side and then turn the mirror over and cut in from the other side.
Rod
Last edited by Rod; 11-10-2018 at 03:39 AM.
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