Kevin wrote: "This is not as much of an issue when the number of frames above and below the excluder are the same and they are lined up, and no issue at all when using a rimmed excluder that provides bee space above and below it."

Such problems are reduced when the frames are at right angles to each other and I often places my boxes thus in order to dissuade the bees from attempting to join up upper and lower frames; but of course you can't do that in those silly rectangular hives.

Chris

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