The holes are larger for a reason, so that you can adjust the seat to fit the toilet. Undo the nut/wingnut and remove the rubber washer, get some "penny washers", place the rubber washer on the top of the metal washer and tighten them up. It it is still loose, use a pair of pliers, but don't overtighten them, simples
Alexandre Meerkat.
March 2011
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