ok great i have plenty of the round disc i will use one of them.. ok so let me make sure i understand now! ok someonme said that " A retract servo is not proportional once triggered it will continue to run its full travel no matter what and when it reachs its full run it will shut off with no drain on the battery " ok lets say my push rods travel is 1/2 inch to fully retract and extend . But the servos travel is 3/4 of a inch thats when the placement of the hole in the servo disc for the pushrods comes in to play . If i am understanding this correctly ?