Re: Winter beekeeping
Probably for another year, use the bottom board with the 3/4 lip up. This creates a 3/4 high bottom entrance.
Then invert the bottom entrance reducer so 3/8 vertical opening is to the top. This allows a 3/8 thickness of dead bees and not block bottom entrance. Entrance reducer can also be periodically removed to fish out dead bees.
I build my winter entrance reducer out of two 3/8 thickness of plywood. The top piece is 1 inch shorter than the bottom piece. I then nail them together to create a 1/2 opening on either end. I suspect some will say it does not matter, however the incoming air than enters at the sidewalls and not the center where the cluster is more typically.
If you always do what you always did, you'll always get what you always got!