Hi Terry, I walked into my shed yesterday to gaze at my 52"HP, and lo and behold, but what do I see on the floor by the rear of the machine? A copperish-colored bolt, with washer still on it, and a whiz-lock nut very close by. I have determined by comparing the pieces to those around the muffler that it appears to be one of many identical nuts and bolts around the rear of the machine. My question is, with so many places where a nut and bolt could concievably have come from on the machine, how do I find out where this one came from? I'm afraid to run it without knowing, and I'd prefer not to have to figure out a way to drag it to the dealer. Thanks.