Here's the bad one. Each rip is two to three inches long and nearly connected around the rim. Plus there is a small one inch on the opposite side. I'd say this one is toast.

11


This one looks repairable.

12

I've seen two methods. VolvoHeretic seems to have had luck with silicone caulk. Elsewhere I have seen suggestions of using tissue paper with thinned Elmer's Glue. The caulk idea sounds better to me.

Luckily, the other two 515 cones are free of damage, best I can tell.

Jeff