A few weeks ago I started a post about installing a Sthl 25-2 trimmer head on a Shindaiwa trimmer. I finally found the part number for the adapter and ordered it from the dealer. I got the adapter and installed it and it works great. It installs in less than 2 minutes. I put it on a brand new T261 trimmer. Used it all day today and I'm pleased with the set-up. Now you Shindaiwa fans can have a real trimmer head on your trimmer and not have to deal with those funky Shindaiwa heads. The part number for the adapter is 4125-713-6605 and is made by Stihl.