I have a MM55 that I use primarily to till the garden. Putting a trimmer head on it, and installing a blade, might work. A better solution I have found is to mount an 8" carbide blade on my fS56 trimmer. I bought a blade adapter kit on EBAY for about $10, and I can easily mount a 8 or 10 inch circular saw blade to the trimmer. With this rig, I can slice right through brush and small trees, etc., when I'm chainsawing in my forest. It does require being quite careful, as there can be a substantial "kick back" when the spinning blade makes contact.