I got this servo from tower hobbies http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXPB41 for my rigger but i can trim the dam thing everytime i turn one way and then let go of the radio wheel it turns all the way to the other side its messed up any help??

Its an undercarrage retract servo. They only operate fully one way or fully the other. You cannot control them inbetween, sorry you'll have to get a different servo unless someone knows how to modify them.

dam it!! thanks for the help