The 2 pics below are from Nick's Nano, notice the rotor rpm sensor isn't fully perpendicular, we believe this caused the top of the sensor to shear off. There should be a 1mm gap and it will have a blue tip (not shown below). When you get your Nano, please double-check this to be safe, would be a good idea to check during preflight. I had a spare and it's on its way to Nick already.