Im talking about the bushings that hold up the back of the A frame that the wobble box, divider, and sickle bar are all bolted to. The bushings were shot, which allowed the whole framework to vibrate slightly. This, according to our dealer, is what took the wobble box out right before we finished up last season. We couldn't tell they were bad until we had them out. Hope this clears up what I was trying (not very well) to ask about.