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The trick I always use to check the housing flange is a piece of 400 grit wet/dry sandpaper on a pane of glass. Wet the paper and run the flange of the thermostat housing over the paper in a circular motion using even firm pressure. The high spots will show sanding marks while the low spots will remain chromed. Keep going until the entire surface is even. Silicone sealant on top of a gasket usually works well. Never had any issues using this method.
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Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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