OK, I have posted a photo of the Mann Lake Feeder with the duct tape around it. It doesn't look pretty, but it keeps the bees on the side of the screen and I do not have any drowned bees.
I like this feeder very much and it works well for when I simply must feed them all at once and a lot. The only problem I have had with the feeder, and probably would happen with most all feeders, is ants. The ants get in and drown.
I never have a problem with moving this feeder if I have to, because the bees always finish off all the syrup inside it.
I can remember one time, they left a small amount of syrup left over and I just lifted off the feeder and carried it far way and dumped out the syrup onto the ground.
Here is the photo with the duct tape around it
Good luck with your decision.