My concern is that, when installed per the 1955 directions, the slider-slot is pointed directly at the leadout guide, thereby precluding frioction on the slot. Logical !
My origianl gut feeling was that line pull is highest at high speed, so the slot should be lined up proper at high.
Then, with the leadouts kicked back, the slot will be subjected to a 15-20 degree side load. Not good, but maybe better than a side load at top speed.
The opposite logic might be that at low speed you need all the smoothness you can get to work the controls, so it needs to be proper at low speed and just live with the problem for the first 16 seconds of the flight. It only needs to slide ONCE at an angle....
hummmmmmm....