Nail boards won't really hurt them - just let them know that, if they push the issue, it WILL hurt. Bears are really smart. They'll figure it out and, hopefully, go elsewhere for a meal that doesn't bite back. I doubt that the nail boards alone would be enough, but should definitely be part of (forgive the pun here, but I really am serious) a two-pronged approach. Pair the boards with some electricity, and you'll have a better shot at keeping Henry & his family safe until the bears find other resources.In Alaska people make nail boards and secure them to their doors and windows whenever they leave their homes. These are large sheets of plywood with huge nails pounded through and sticking out the other side.
I could makeshift something like that maybe. But can you believe I'm actually concerned about harming these hungry bears? I don't want them hurt.