The swashplate disc can be controlled by 4 ball-end bolts at 90° or by 3 ball-end bolts at 120°, whether the linkage is direct to the servos or utilises bellcranks. As standard there are 4 linkage points.
In both types the swashplate bolt assumes the additional function of one linkage point. For a 120° linkage the ball-end bolts have to be replaced with longer versions Ord.No. 060/4, and re-positioned.