Re: Elbow Entrance
Same way they do when you use a robbing screen. They pick them up, carry them outside, and fly away with them. If I were to use any sort of PVC fittings in a hive, I would sand the surfaces the bees need to walk on as the plastic is very slick.
BTW, welcome to Beesource. You picked an interesting thread to make your first post. Head on over to the welcome forum and introduce yourself. Try to include your location as well. MO is a big state.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.