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2) If the bin is 2.66” corrugation the hole should be centered on an outside hill. 3) If the bin is 4.00” corrugation the hole should be centered on an outside valley. 4) Use the mounting plate as a pattern and drill four 3/8” holes through the sidewall at the swich location so the place can be bolted to the bin. 5) Add foam weather strip around the top and side of the mounting plate. 6) Caulk the underside of the mounting plate, on all sides of the 2” hole, and where the plate meets the bin. 7)