This is my first attempt at a fidget spinner. To assemble you need:
1x inner casing
8x bearings
2x end pieces
1x body
The inner casing is placed in the middle hole, and the bearings are fit between the casing and body. The end pieces fit inside the inner casing, closing the mechanism and giving your thumb and finger purchase. You should put 3 American pennies in the 3 holes on the wings for weight.