After finishing up the installation of the control column assembly, I noticed that it didn't rotate very freely :-( I reshimmed it a couple times but was never able to get it to free up. After reading several threads on Van's Airforce about control rigging I determined that something was wrong. You want the control column to rotate with little or no friction- which was definitely not what I was experiencing.
I unbolted the assembly and pulled it out and then checked the bearings. The left bearing was very stiff and did not move freely. I tried using some Tri-Flo on it to free it up with no luck.
I decided to replace the bearing with a new one. The problem is, the bearing is securely riveted in place and there was no simple way to remove it. I decided the best way to proceed was to pull the entire rib out of the assembly. I removed the front panel from the ribs, then unbolted the rib. Then I carefully drilled out the rivets holding in the rib and removed it. Then I could easily drill out the rivets holding the bearing assembly and then drill out the bearing assembly rivets and pull out the bearing.