Put a piece of fine sandpaper/emory cloth on a flat hard surface (marble cutting board for example) and something with a square edge like a thick steel straightedge on top. Use the straightedge to insure that you keep the saddle square to the surface to make a totally flat bottom.
Mark the edge on either side at the bottom with a pencil line so you can see how much you're removing. Measure, if you have a definite amount you want to lower.
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