We are using a steel tool to core a 2 inch diameter hole in the back of a 10 inch f/4 Pyrex mirror. The mirror is at the #120 stage of grinding with the same size grit used for coring. The cutting at this stage will stop about 3/16 of an inch from the front surface and will be completed from the front surface after polishing and figuring. The work was done using Joe D's drill press.
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