center support bearing , rear driveshaft

I had to remove the rear driveshaft on my 2005 equinox, in order to replace the center support bearing. Much to my surprise when I removed the six bolts at the front of the shaft, and removed the shaft from the transfer case, six ball bearings , and a cage hit the floor. I replaced the center u-joint , and support bearing. Now comes the tricky part , how do you put the shaft , with ball bearings and cage back together?