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Glass table? Not a great idea. Glass is usually flat, yes, but what about when you put a chunk of metal on it?
If I HAD to have the head resurfaced and I didn't want to or couldn't afford a machine shop, I would use a large file followed up by metallic sand paper and go SLOW. The critical thing is making sure you keep it flat.
Is the head warped? If it's still in good shape you shouldn't need to have them resurfaced. Before you go through the trouble, verify if it is warped or not. I would not try to fix a warped head DIY.
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