I know all the drain plugs are magnetic and are meant to capture small pieces of metal. When I change the engine or trans oil I have never had any fuzz on the plugs at all. The primary on the other hand is another story. I have changed it twice and both times had quite a build up of fuzz on the end of the plug. Is this fairly normal or something to be concerned about? Could this mean an improperly adjusted chain? I've checked it and believe it is within spec. I run HD formula+ for lube.