Harp Case for Amp Tilt

I was doing a show with Gary Primich many years ago and I was looking around for a chair or something to put my Bassman on to get it off the floor. Gary tilts back the amp and places a harmonica box under the front-bottom lip of the amp and says, "I find that one Hohner harmonica box does the trick to tilt the amp back at just the right angle so that I can hear myself well." Thanks Gary.