Hard year in the classroom

Two of my five XO laptops, that had a particularly rough year. The one on the left (Jude) lost the "F" key - somehow it just tore off eventually, and I replaced it with a piece of paper and some tape. Works fine. The XO on the right (Arbor Heights) had a student actually fall on top of it in a wild moment in the classroom. Still works fine, I have the broken off piece, and need to find the right kind of glue (hobby shop trip, for sure.