Let’s take a look at the YoYoJam Classic for a moment. In past discussions about modding them people have wondered about what they look like without their caps. Allow me to shed some light on the subject. Under the caps, the body of the yo-yo looks like this:
http://i.imgur.com/EZGl9rBl.jpg
They use the now standard YYJ solid spin axle, but the hub is pretty beefed up. I bet these yo-yos would take a considerable beating before the hubs took any damage.
This is the profile of the inside of the caps:
http://i.imgur.com/dSOCupcl.jpg
The caps are simply press fit into the body without any glue. You can remove them without much damage if you are careful and use a thin enough blade to pry them from the body. However, without a good way to hold them, it could be a dangerous venture. I used one of my lathe arbors to hold the yo-yo half and keep my hands out of harm’s way. Putting them back in place would be done by freezing the cap and warming the body, pressing the parts back together, and allowing them to come back to the same temperature and tighten up.
It feels like roughly one third of the Classic’s weight is in its caps. (Someday I’ll actually own a scale accurate enough for yo-yos.) Those looking to cut into the center of the caps to mod them into lateral caps should know that the center of the caps are about 3mm thick.
You can all thank iYoyo58 for letting me work on his Classic that you see here. More work on this yo-yo is coming soon.