I brought the head of my Craftsman trimmer to an Echo dealer to see if he could help me out with a problem. My trimmer is an ancient bushwacker series and Sears doesn't make all the parts for it anymore. Becuase it is heavier than most and has a strong 37cc engine, I want to use it primarily for thick brush removal and I will buy an SRM-210 for lawn maintenance. So I brought my trimmer head in and asked the guy at the dealer if the heads were universal at all since I was looking to switch it from a string trimmer to a 10" blade. He took the head apart and showed me why I didn't need a new head and that the blade would fit right on the head I had. With the purchase of a blade, a little metal shroud, and a left-handed nut that he pulled out of a spare parts box, I was good to go. He probably spent over twenty minutes with me after all was said and done. It's nice to see that even though I wasn't in there to spend thousands of dollars on equipment or repairs, he still gave me his valuable time to help a little guy out. I gaurantee I will be back there again.