I know this is probably a longshot, but hey you never know what people need ,want or just have laying around.
I've got a 2.25" Wico trackball out of a Track and Field (remember when they switched from buttons? man there went my pencil trick). This would be perfect for a person who wanted a trackball they could put a billiard ball inside. It works perfect with Oscar Controls USB hack and TB harness (not included).
Anyway I would like to trade for a 3" TB in any shape.
pm me if interested.
ny