I cut the sides of the sheet so there is a lot of wire poking out and then wrap the wire around the existing wire. I guess I didn't wrap it enough times and he just pushed it out. I didn't know how strong raccoons are when I did this; I thought it would be like keeping out a house cat.Lesson learned! It's like this:
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Have you seen cage clips? They take special pliers. The clips and pliers are both inexpensive.