Another one of those projects. Trying to get a joint to live. These things fire up and run 20 km/hr pretty much all day. Running over potholes rocks etc... They bash into walls and pound over ledges or whatever might be in the way. They tested some in a unit for 5000 hours. The serviceability and new race material I experimented with worked well. It's jobs like these that have helped us constantly improve our joints and knowledge of elements and abuse.