Well at least you found the ball. The problem is the bearing assembly - this is screwed in from the bottom. You will see a slot on the bottom of the shaft - tighten this up and you then have the clearance. Same thing happened to me when I 1st brought home my brand new Gyrodec. My dealer had set everything up at his shop. I am guessing the trip home and the movement allowed the shaft to back off a bit -that is all it takes.
Hope this works - good luck
Hope this works - good luck