I trick that I learned seems to work if the joint is starting to get loose. Turn each of the blocks 90 degrees and drive out the center pin and turn that 90 as well when you push it back in. This gives all the tension surfaces (during the left and right movement) new or unworn areas. Only the aluminum channel is old. Did your bell kit come with a new center pin as the pics Ive seen of them does not show it. It needs to be replaced too along with the blocks if your going that route. Yes, I remember needing the clip as it held the blocks in the correct alignment or something.
1975 CJ-6 1983 CJ-8
1986 CJ-7 Laredo 1986 TJ-7 Trail Jeep
2003 Inca Gold TJ Rubicon