Perhaps the most failed purchase I have made. As soon as I received it, I changed the sole from delta to rectangular. After 10 minutes of use, the sole no longer comes out, it's as if the (one!!) support screw got stuck. During this time, I also noticed that the vibrations are strongly transferred to the hand, it does not have handles, even detachable ones. The dust container, although it seemed like a better choice than a bag, unfortunately came off on its own due to the vibrations. Finally, it requires persistence to achieve results, it is not powerful enough. And to avoid any misunderstandings, I have another one from the same company, from the red series, and it works fine. That one has 4 support screws for the sole plus an internal one that supports the bearing. I wanted to try out the sole changes. Money wasted...