These scarifying quick change cartridges are now available from the manufacturer Allett. For more information on these Allett cassettes to fit your cylinder mower please use the following link.. Simply remove the cutting blade cassette from your mower, insert this scarifying cassette, & your lawnmower is immediately transformed into a powered raker. This will clear your lawn of moss & other debris, allowing it to breath & promoting growth. This 20 inch cassette is suitable for the ATCO Balmoral 20S & 20SE models. Please note that this cassette will only fit those machines equipped with the Quick Exchange (QX) cassette system