MAN.......those things are a PAIN to make work. I have one with a bad diaphram in it. I heard that Limit Engineering can fix it/modify it. (John Craig) Let me know if you want the one I have if your diapham is usable. (though I think they were all bad from ATR. You can also use a Turbonetics Racegate in its place. Might have to slot a hole or two, but they usually bolted right on for me. I have replace many of them over the years. Those ATR units were ..........poor, at best.