Well, I became quite determined to fix a very loud vibration in the clothes dryer tonight. The vibration came out of nowhere, and was difficult to pinpoint. I did a cursory check to make sure all the screws were tight and that there were no obvious causes for the vibration, and found nothing. I then took the dryer apart to check the bearings for the drum, and found no problems. Finally, I took the blower apart to clean some lint out of it, and what did I find??? A shiny penny, and a SHARK TOOTH. Where the heck did a shark tooth come from that it could find a way into my dryer?? I put everything back together, and the dryer now runs like new. Somehow, I think my two year old son is responsible for my multi-hour battle with the dryer tonight, but I have no solid proof.