1.  I have n e v e r  had a mouse in a living hive.
 
2. If I can't get my baby finger into the bottom
  board opening, no Maryland usa mouse of any
  dimensions has ever gotten in.
 
3. I always run the s h a l l o w  side of the BB up.
 
4. Entrance reducers mean extra cost and extra work.
 
5. I have n e v e r  used an entrance reducer in
  35 consecutive years of beekeeping.
 
Ciao - still learning, however.
 
Jack the B-man
   John Iannuzzi PhD            * "Singing masons building roofs
   9772 Old Annapolis Rd        *  of gold."       --Shakespeare
   Ellicott City MD 21042 usa   *  20 Italian colonies
   [log in to unmask]   *  3-1/2 decades in beedom