i have a 21inch lawn boy silver series that is about 6-7 years old. i i have never been to satisfied with the cut. always clumps and only throws the clipping maybe 15 inches. i just sharpened the blades on it and for the hell of it when i put back the blade i didnt put back the mulching blade that goes under the reg blade. i just used it... i was blown away! it now throws the clippings about 3 feet and cuts nicly. why was the mulching blade causin such bad results? if only i discoverd this six years ago! this mower is only used as a mower for very steep hills so i never really cared to much bu now that it cuts great im happy with it. just thought id let you lawnboy owners know! and comments welcome!