Help electrical gurus!!

Horn metal diaphrams are seperated by this spungy foam. It rots, and eventually the upper plate sags and makes contact with the lower plate. Off goes your horn all by itself. This usually occures in the middle of the night or when your in a movie theater (kidding). You can replace the foam with craft store foam (look around Michaels etc.) you'll find something similar. I used these foam snow-men characters from a craft store. Been 4 years and no problems.