My bell cranks have two roll pins each...probably for the reason in Dan's post. The problem is that the holes in the bell crank, through which the roll pins are pressed, get "hogged out" and elongated. This gives the bell crank some play, and puts more pressure on the roll pins. The fix is to either replace the bell crank and roll pins, or drill holes 90 degrees away from the existing holes and start with fresh holes both in the shaft the comes out of the seat and the bell crank.
The thing ai liked about Rob’s was he included a long drill bit with his. At least he did a long time ago when I installed them. Good to know there is another source. thx
The roll pins you speak of are retaining the cam on its shaft. The clevis pins I refer to are in the bottom ends of the seat back side frames, and ride on the cam. That cam grinds away at them, wearing them thin. Because the wear and damage are hard to see, in between the forks of that seat back frame, they are most often overlooked.
Mc Farlane has parts cheapernCessna.