[MrFixr55]

The shafts are concentric. The gear is on the coarse shaft. This should smoothly operate the tuning cap without the fine shaft in place.

Is the fine shaft tapered? The small ball likely goes in first, followed by the spring and shaft. With the fine (inner) shaft pressed as far as possible into the coarse (outer) shaft, add the 3 large balls and grease (Dunno if the balls should be greased, what did that area look like when you took it apart), insert into the collar, install the clip and release the shaft. The 3 large balls should rest in the groove on the inside of the "collar". Turning the inner shaft should cause smooth movement of the outer shaft.

This is all theory on my part, as I never took one of these apart. Good luck.

PS, that cleaning job looks fantastic!