I was thinking of lining it with something. That thought crossed my mind too. I was thinking I could put some sort of rubber grip on it or at least something that isn't toxic and can give an indication of knawing. I might also line the hole with the KD pine around the edges so that if he chews that, it's fine. Kind of like a thimble around every edge. It shouldn't be too hard to do. I'll keep the holes square and then put a 1/2 inch thick or so "U" shaped piece of KD pine around each of the edges if you can imagine that.
As for the killing someone else's chin... You do realize that there are other small mammals out there that use the same exercise balls that won't over heat? Those balls are good for mice and rats and guinea pigs.... So thanks for the positive comment, I appreciate being labeled a killer of someone else's chin.
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