As you can hear the noise, its because the rubber wheels are rubbing on the aluminium frame. Ila had a wonderfully simple solution, just a few drops of oil. The huge amount of friction that allowed the noise to be made and very importantly allowed me to walk, however vanished with the oil. Luckly we took the video before applying the oil cause after it, it was just impossible to stand on and walk with the smoothest ride possible (if i could i mean). So now the picture is clear, its not as easy as it seems from the video. I’ll need to put brakes onto the wheels, to learn atleast.