Today I had to take apart an organiser and the ball bearings were not captive. Luckily I knew this so opened it up over a box. The ball bearings were numerous and they are about 1/8 inch diameter so they are small. So the dilemma becomes how do you get them back into the sheaves. The key is shaving cream! you put the shaving cream in the bearing race and then put the bearings into the shaving cream. It is sticky enough that it holds them all in place while you reassemble the hardware. Then when you are all done just wash the cream out with water. Voila!