I now own a mid-70's Dunlop JH-1 wah because my previous unit (which shall remain nameless) quit when I was in no mood to deal with it rationally. I jumped up and down on it (hey, it's a [u]stompbox[/u] right?)!!!

This was not a successful troubleshooting technique, so unfortunately, I do not have any (helpful) personal experience to offer you.

There are reasons that there are service techs in this world - my own theory is that they evolved as nature's response to the genetic perversity that produced incompetent design engineers! :rolleyes: