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Thick plastic plate, 1/4 -inch, slotted holes for adjusting up and down, two flat head screws and 6 two 8 7/32nds holes spaced out and drilled through. ( gotta check 7/32 inch diameter) Just big enough to drag a drone out the hole.

That is all I use-year round and when treating via OAV. I use a stick or tighten screws to insure it stays open in summer. I also use a screened bottom boards with sticky board in place - most of the time.
 

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Get some small nails and put them in the entrance reducer every 3/8ths of an inch or so. The bees can get through but the mice cannot.
Here is a picture of it. The opening is about 3/8 to 1/2 high and the small nails are spaced on about 3/8" centers: a little closer if you are bothered by shrews.

The two deck screws can be gripped to pull the reducer out for cleaning. You may have to do it a few times till all the drones are turfed and occasionally during the winter so the entrance stays open to prevent smothering your bees if you have no upper vent or entrance.
 

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I use a strip of aluminum flashing the length of the reducer. I bent it 90 degrees and slip it under the bottom of the box. It's 3/4" or the depth of your excluder. Tin snips cut an opening the size of the opening, then bend it so it's 3'8" so the bees can get in but not the mice.
 

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Something like this would be easily adaptable to various hive entrances; this is what I did for my two Layens Hive entrances:
Green Technology Table Automotive exterior Bumper


The upper plate holds the whole thing in place and the lower panel slides side-to-side to adjust the entrance size.
Fully slid over the entrance the 3/8" holes are my mouse guard.
Flip if over and the holes are too small for the bees, but will allow ventilation.

Funny bees. Currently the reducer is all the way open . . . they've still propolized it.
The second one is made a little differently and totally blocks the door when installed 'upside down'. They've also propalized it.

John
 

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Here is a picture of it. The opening is about 3/8 to 1/2 high and the small nails are spaced on about 3/8" centers: a little closer if you are bothered by shrews.

The two deck screws can be gripped to pull the reducer out for cleaning. You may have to do it a few times till all the drones are turfed and occasionally during the winter so the entrance stays open to prevent smothering your bees if you have no upper vent or entrance.
Funny. I did this exact same thing yesterday using linoleum nails and I thought I was inventing it.
 

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I can see what Michael Palmer does would be much more labor practical. The sharp fold in the screen would force a mouse to approach an opening at a very sharp angle which he just could not get his head around.;) Coming square on to half inch mesh would not even slow a mouse down.

I see some of this style in my winterizing. The palisade of small nails spaced in the entrance reducer is effective but fiddly if you have many colonies.
 
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