So, story time!
Ringman and I were practicing with a set of nunchaku that he had got a while ago. We were out walking around and passing them back and forth as we'd take a few minutes to walk and chuck. After I had finished doing a few over-the-shoulder passes and practicing a flourish, Ringman took them and did a flourish... and the chucks broke.
The chain disconnected at the pivot joint and the handle went flying across the road!
We were determined to fix our broken nunchaku, and noticed that the joint was held together with ball bearings. So, we decided to go into town to the nearest store that might possibly have ball bearings of that guage; Auto Zone.
We talk to the triple black belt at Auto Zone and he said we were better off buying new nunchaku, as he's had the same thing happen to him dozens of times.
Off we go to the nearest dojo, Dubb's Karate. We just so happened to stop by when they were having a sale on supplies, so we look through their selection. Ringman got a set of oak chucks and I got a set of bamboo. They feel great and have a smooth swing.
Here's a pic of the broken nunchaku:

The sensei at Dubb's said that he had never, ever seen that happen to a set of chucks.