I'm replacing the rubber on my SOG's and full size wingers and need a measurement for the SOG. I measured the originals and cut the Theraband silver to the same length however they will not launch . Take the pressure off and the servo actuates but with the tubing attached nothing. Only thing I can come up with is I cut the tubing too short and there is too much tension. I did the same with all the full size and they work fine.