Hi All, I came across a BG-2200 motor with the following number: MHN - 3P2 RBD,  DC 3V, pulled from a working BG2200 apart from a female connector - in opposition to a BG400x motor with a male connector and a metal pully - in opposition to a “plastic” pully fitted what is different with that kind of motor why I could not use it in a BG 4002/4  ?? would somebody care to explain that to me ? thank you kindly ALF