I figured that I would create a new style of spinner that I haven't seen on this site. The center ring is held in place by the 6 screws. This one uses (6) 1/4" nuts, (6) 1/4"x1" screws and one 608 bearing.
This design is a little thicker and heavier than a normal spinner, but it's still manageable. The center ring is 9mm tall (ball bearing is 7mm). The ring has 6 recessed areas so that the screws will go into and help hold the center ring in place. The outer piece is 11.5mm thick. I made it that way so that the screw heads wouldn't stick out too far.
This design is about 3" in diameter.
The design is in two pieces so you can print the center ring a different color if you choose.