I am new here and wanted to share my new frankenstein creation with you some of you that are fans of the bed red-definers. I have a Stihl Kombi KM130R unit with the redefiner head for it. I mainly use it the year after I rented a pull type bed edger. NO new edge installs with the redefiner....at least until now. I have looked at the Echo units over and over because of the cutting blade design with the three teeth. My Stihl does fine removing debris and soil that has just settled in the last year in the edge. Finally I have worn down my blade to the point of replacement. A buddy of mine recently purchased the Echo and we decided to take it apart and just see if the blade would fit. It fits. I ended up having to add a washer to be able to tighten the bolt up enough due to the thickness difference of the blades. My 36cc KM130R loves this new blade and I have created 100's of feet of new edge this season already. Sorry echo but 28cc isn't enough. My Stihl hardly even changes tone when I sink down.