Mouse Resistant Bypass Cover

Hi All;
I have been keeping a  square of superwool on top of my studio bypass.
As soon as it started getting cold I noticed small bits of superwool all over the top of the bell.
It did not take the industrious little fellow long  to tatter my super wool!
Today I took new superwool and covered it with heavy aluminum foil.
Hopefully, I now have a rodent-resistant insulated cover to keep the heat in my bypass hot and flowing toward the chimney.

I just bet that mouse is gonna use that superwool to make a mini RMH with to keep its family warm this winter!
Better keep an eye on your woodpile, as that's going to be the next thing to go.