And now I know why these were 3D-printed by the poor bastard who had to fit these motors to the last prototype, for they raise the spindle clear of the airframe.
Another of the joys of working with the U7 motor is that it uses shitty little 3mm bolts to fix it in place, for which ideally I need bolts of 30mm length that UK DIY depots do not generally stock.
There will therefore be an interlude whilst I reduce sixteen 40mm bolts from the local hardware store to a 30mm shank using an angle-grinder.
An exercise that will convince you ~ if nothing else does ~ of the futility of life.