I think maybe he put some on the backplate of the control horns--I believe that is what I read. I noticed that as well. Probably should have used CA, if anything. I usually don't put any glue on at all, unless it's the kind without backplates--and I really hate to use those. In fact, I usually replace them with real horns utilizing backplates. I once built a little 1/2 A kit that used control horns with screws--no backplates. They were dubro's, and all I could find. On them, i put some CA down and then screwd them into place--they didn't go anywhwere.