Hi guys just converted my sky view mount to goto using the orion kit, all works fine apart from the dec motor, worm gear seems to jump in and out of engagement and makes a horrendous noise doing it. Have tried two different motors both new and same result, also tried the motors unloaded and both the same so eliminated tight a mount worm gear. Power is 12v dc via a 10A power brick and also tried two different motor control units, pretty sure this is a mechanical problem and heard rumours that its possible to adjust the motor gear train by a single screw adjustment but can't find any instructions etc for doing it, anyone got some suggestions.