I would think that if the cables were at the proper tension that it would be pretty hard to get the horn on the servo shaft when the everything is at center. I'm also not real crazy about removing the little clips on those Sullivan clevises. I'm sure they never stay on as good after removing them a few times. I'm thinking of just leaving the stabs on at this point. It's seems like more of a pain than it's worth. It would fit in the car better with them off but I'm sure I can still squeeze it in. My 25% CAP232 fits ok but it 7 inches shorter.
ORIGINAL: Flyrite
Just unscrew the servo screw and remove the horn, to re-install center the elevator with the radio and the servo arm should re-center, or you could mark it, the only problem here would be if you are using metal gear servos, it would require loc-tight everytime you re-installede them, what a pain.