i bought this from tower, mostly for the purple locking collars. but i'm looking at the other pieces, how does this actually hook up? what is the the 3mm bolt for? what is a pivoting collar? it come with a ball cup for the throttle carb end, but not the ball.. is this totally useless for an evader linkage.

i got the collars on, and it looks cool, so i got what i wanted. but wondering if i can use the rest.
http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXHWP2