I agree with  james, however I have developed a shim of my own with a
pending patent which will soon be available. It resembles a slatted rack, in
9 and 10 frame models. With the addition of the slats between frames there
is no violation of bee space. My first few prototyes were prone to breakage
due to propolis build up and the thin nature of the shim. After
experimenting and modifying from dato to router cuts on the front and rear
of the shim, the breakage problem has been cured. I find it to be extremly
easy to add to or take away from the hive. Like James said, the opening is
easied to defend and the shim is not quite as unsightly as a whole bored
through the side of your box.

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