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Try this on YOUR hive sometimes. If you have a flat (not bound) excluder, turn it 90 degrees so the ends stick out the sides of the hive and the ends of the hive are open. I'll bet the queen doesn't cross it and I'll bet the bees will be happier for it.
thats interesting , that all the excluders I have are the metal flat one's, Ill have to try that one thanks MB.