I do not have an answer. I also have the same problem. Blade partially backed out. Took it to my garage, and when I started removing the blade, 5 pieces, which form the 5- point star, fell out like BB's. With my knowledge of metal, it appears the star formation at the factory is poorly made. I can see the formation of the star in the adapter. I believe Husqvarna needs to review the metallurgy on this part. If a better part is made, I would be interested in obtaining one. This is a very dangerous part to break.