I've got my hands on an old beat up Sovereign tenor horn which is great in every respect. But it does have one injury that could do with being fixed. 360 degrees round from the bell the pipe has become disconnected. It is where two pipes are joined by a sleeve that goes over both of them: one of them is loose. Is still sits pretty much in place and doesn't make much difference, but some air does escape from there. So what are the options for fixing this? It is a snug fit when I push it back in, but the springiness of the horn pulls it out again. So I'm wondering if I should put a bit of super glue around the exposed bit and then shove it in.