How to drill a hole in the glass
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To drill a hole in the glass seems to be the problem without solution. But the solution does exist and it is quite simple. You just need some turpentine.
Drop a couple of drops of turpentine on the glass. Use putty or ordinary plasticine for a border to prevent the liquid from spreading. Then begin to drill on low speed adding some more turpentine if needed. And remember that the drill should be sharp.