There has been some discussion in an on-going thread and in threads in the past regarding ball links binding up. I have seen this on other peoples airplanes and have not heard a good explanation of what causes this problem. When I was in Tucson, some thought that the hot weather or temperature extremes had something to do with it. Other thoughts are that lubricating material was incompatible with the ball cap or a combination of temperature extremes and improper lubricating materials. Whatever the cause, the problem is real.
For my flap/elevator horns, I have used nothing but the ball links and caps from the race car counter of the hobby shop. These have no play, are totally free as in no friction. I have used these on a number of airplanes over a large number of flights over a period of a large number of years and have never had a problem with them binding up or showing any kind of wear. I do not use any kind of lubricants on these ball links.
Keith