I noticed that all the motors have different magnetic resistances or detent torque when turning them by hand when the drone is off. 2 off the motors have close to the same "nothcy" feeling when turning but the rear right has the least and front right has the most resistance or "notchyness". I know that there are going to be variations in the manufacturing process from motor to motor but just wanted to know if this is normal or if its's something to be concerend about that may lead to future issues.