Heres the file with the puck as a solid group.
puck.skp (2.2 MB)
And here some videos of how it was done, I used Flowify(obviously) vertex tools. from ThomThom, to fix the four parts where the middle of the geometry met, and Bevel tool from Mindsight studios, Cleanup3 to get rid of unnecessary geometry, and Solid inspector 2 to check if it was a solid object, both plugins from ThomThom.