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I was looking through my old woodworking stuff and found a few boxes of ‘micro mesh’ abrasive sheets. They can be used for anything, but the boxes I have mention using them to smooth marred windows...

I haven’t used this for straights, but I used to use this method for woodworking. Use a piece of thick (about ⅜ inch) plate glass. It’s perfectly flat, and avoids the weight and expense of granite. I...