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It's quite easy, you can use a piece of pipe of a suitable length and diameter with wooden circles fixed to the top half with a bolt to grip in the drillpress. You then feed the pipe gently onto the mirror using #80 grit and water at a slow speed. Go dead slow as you near the other side for fear of bursting out a chip. A better way is to make a jig for the mirror, then grind 7/8th of the way through then turn the mirror over and attack the other side. If you're making a Cass you would polish out first before breaking through on the front side. A diamond holesaw will be quicker but more expensive, hardly worth it if you are going to make only 1 hole.
Tip...cut 4 slots into the cutting face so the water/grit can circulate.
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