The light fixture at the end of the pool doesn't work and is always falling out. I bought a Kreepy Krawly but I am afraid to use it while the light is hanging out. Can I just glue the stupid thing in so that it will stay there and stop falling out? What kind of glue to use underwater? Or is that a terrible idea? We bought the house last year, have no idea if there is a switch on the pool light or where it is, it has never worked.