I have been designing my own Lego Bae Blades. This is a picture of the bottom of one. You see the red dot in the middle? Everyone of my Bae Blades has that. Its the part that makes them spin. I made this one with 4 pieces of Lego.
This is a picture of my Lego Bae Blade spinning. It can go spinning very quickly and it's very easy to make it spin. I have about 5 more of them that can spin too. They are all different designs but they still all have the same little red piece in the middle.