Here is that lower column bearing I was talking about. I miked the last ball I had and it was 3/16". That is a common size. I have a ton of bicycle parts and a jar of small bearings. I scrounged all the 3/16" ones I could and used them to restore that lower bearing. I cleaned the rust and old grease out, re-greased with Marine grade OMC Triple-Guard blue grease. This bearing is a nightmare. It has three parts and they all want to confound you. You have to grab the part that sticks out and moves and hold it with needle nose pliers. That opens the gap enough to squeeze in the new balls. I used a magnet-on-a-stick and loaded it with balls but make sure you don't use too many. Too many will jam up the bearing and it won't turn. Once full you can press the bearing back into the adapter. The pics are the adapter, bearing race, and the balls, then all put back together. That little thing is not available for love or money so it behooves us to just restore what we have.