We find that the ideal dummy board is made of 1/2" marine ply (which does not de-laminate) with a top bar of the same width screwed and glued to it (hardwood is best as it is stronger).
At the end of the inspection the board can be levered away from the side wall to ensure that all the frames are tight together.  This leaves a gap between the wall and the board of 1/2" - 3/4".  Few bees gather in that area, preferring to remain on the comb - but it is best to leave a small gap there when starting the next inspection as it is always possible that the queen could be there - particularly if the hive is smoked too heavily.

Reducing the height of the entrance brings the frames closer to the mesh floor and prevents drone comb being built on the bottom of the frames.  It also has the advantage that no mouse guards are required.  With a fully open mesh floor there is no problem with a smaller entrance.

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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