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Too thick.
Get something thin like a super glue.
Make sure you clean the surfaces real good, magnet too.
Clean it and then clean it again.
Leave some scratches in the magnet so the glue can get in.
Glue it in place and then take a thin piece of metal like a razor blade and slide it
in the crack of the ends of the magnet.
Try to spread it.
Then after it dries, try to fit it and make sure it doesn't rub.