Functionality of Bell-rotor can be achieved with a simple and compact structure, if we omit Lego swash plate. Part "Rubber band" acts as a torsion spring gently forcing blades into zero degree pitch relative to each other. Thus pitch rods jacking on hinges are pressed down to swash plate. Swash plate here is a flat, non-rotating plate can be tilted and lifted around main rotor axis. A 6-hole disk fixed to main rotor axis drives pitch rods, whose lower tip slides on swash plate, thus we do not need any bearing. When swash plate is lifted or tilted, pitch rods will increase blade pitch from zero against the force of torsion spring. Rotor hub has 3 studs diameter and 5 studs height (all the extra stuff outside this are to make blades foldable).