Took me about 4 hours to put the horns in but I think it came out pretty Good.I spent most of the time making the bracket to hold the horn.I had to use a jigsaw to cut a 1/2 piece of steel,Wasn't fun at all.All i kept thinking was I wish my tablesaw was set up.Then I ran out of the rods for the welder so im having him come back tomorrow.Ill just feel better if I weld around the bolts so they don't loosen up.The first that always blows off the trucks after the train horns is the hood latch.I just make a bracket that connects the rod to the shaft so it doesn't looses up.Anybody else have air horns?