Hi , Thanks for reply. No it does not go down by itself when the motor is off. There is nothing only a supplied 25mm eyepiece on it. What I notice is that with the other arrows when I lift my finger off there is a tiny little click when the motors turn off - which is instantaneous. With the down arrow there is no such stop, one hears the motors slowing and I assume it is just friction that brings the OTA to a stop after it has travelled about 10 degree of downward motion (more than intended). Cloudy tonight , might have a chance to try it out tomorrow, but this behaviour is so pronounced that