I have reciently had H&Rs put on and when I got my car back there was a loud suspention boom. I took it back and they said that the mechanic simply didn't tighten the center nut on the left rear strut tight enough. They tightened it and it went away for a while, but now when every I hit a set of bumps the nut loosens up again and I have to crawl into my trunk to tighten it. Did the mechanic break something, did I break something, or am I not tightening enough? Does anyone know what the spec is on that nut, lbs/sq inch?