I think more Aid Routes would go clean if people had triple sets of just the smallest two. I have found that they set really hard in sandstone. I think this is because the sandstone gives a little and causes it to wedge further. This makes it a little more difficult to clean. I am talking about Navajo and Wingate sandstone. It is easy to mess up the cables and springs if you are not patient cleaning them in sandstone. In granite they are a breeze to clean, even after aiding/falling on them. Like others point out, they work well in Flares because the ball can pivot. I Heart Ball nuts.