Well, I started using small plastic wire ties (the kind DH used to use for electrical work) for a little while now. So far the critters haven't managed to break them. They keep the cage fastened securely to the chain link fence and one keeps the cage closed. I just cut the one tie that keeps the cage closed when I need to put another suet cake in. Then I put a new one on when the suet cake is in place. Of course, I'm still replacing the suet on the far side of the yard too often. The other one on the back fence is used up more slowly...maybe because it's not very far from the house. Obviously, the night critters are still raiding the far one, even though they haven't managed to figure out how to break the ties...yet. I know how you feel about putting a new suet cake out and next day it's gone...it's not that cheap, you know? I asked DH to check on maybe getting them cheaper online...he's good at that sort of thing. Yay for cheap!