I am having a problem with the sound of the horn being 'dampened' after it is mounted. I have tried using two bolts on the mounting stem, so the body of the horn doesn't touch the bracket, and it still sounds muted. Someone suggested putting a spring between the horn and the bracket, which helped some. If I test the horn with it hanging from the wiring, it is extremely loud. This horn is a cheap aftermarket round horn, no plastic trumpet, with a single threaded stud on the back for mounting.