Everything is set correctly and plugged in correctly. I now have it taken down to the SP. When I move the stick to the left slowly you can see the the SP move down slightly and the same if you move the stick to the right but the SP goes up slightly. I am begining to wonder if the SP is bad. The little brass guide ball is loose in the housing is this normal or is it bad? I cannot get the servo arms perfectly centered because the serv itself is off cnter and the trims are centered Should I take the servos apart and cener the output shaft?