I converted all hives to permanent OMF and at the same time reduced
entrances to 7mm (no need for verntilation - plenty via the floor)
picture here:
http://www.stratford-upon-avon.freeserve.co.uk/Newsletters/September2005.htm
This has eliminated the need for mouse guards and I have not seen a shrew
in
a hive since either (not sure how small a slot a shrew can get through).
Another benefit is that I never get drone comb built under the frames.
Best wishes
Peter Edwards
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