Double-Decker Fidget Spinner Mod

This is a quick and easy print that allows you to create double-decker fidget spinners. Also included is an STL for a simple spinner that uses 1/4" shot/ball bearings instead of the typical bearings for weight.

The video of the assembly and test spins is available at: https://youtu.be/lOmJtmEajBM

My other spinner designs are available at:
Volume 1: http://www.thingiverse.com/thing:2251166
Volume 2: http://www.thingiverse.com/thing:2257685
Volume 3: http://www.thingiverse.com/thing:2260326
Volume 4: http://www.thingiverse.com/thing:2269281
Double-Decker Spinners: http://www.thingiverse.com/thing:2261906
Volume 5: http://www.thingiverse.com/thing:2293420
Volume 6: https://www.thingiverse.com/thing:2291313