you are welcome ted, sorry you had trouble the first time around.
i have used various mouse guards, but now just use hardware cloth over the entrance, usually by the time i place entrance reducers on, the mice have found warmer facilities or have croaked from the various means i use to get rid of them, however it is still a great idea to protect our hives from mice, and i have placed hardware cloth over the e/rs.
i leave the e/r's as they are, or leave them off completely. some reverse and use them upside down. i tend to take swipes through the entrance on the bottom board during winter months with a slim jim.....
having a bottom and top entrance.....? my HO, an absolute. an upper entrance for us in north country, both for ventilation and for bees to exit when the bottom gets clogged up, and it will. the bees move upward, so the upper entrance really does make sense for them on warmer winter days to exit the hive, and i truly believe in the upper entrance during winter months for ventilation. my upper entrance is a 3 1/2 " notch cut out of the inner cover.