On Friday, October 6, 2017 at 8:44:55 PM UTC-7, wrote:
I'm doing a roulette wheel and used the common hardware lazy susan disk. However, the weight, using it vertically, and repeated spins caused a ball bearing to fall out. I am looking for something either better or sealed. The wheel weighs about ten pounds. Ideas?

Tapered roller bearing. Same as on your car's front wheel.

https://www.banggood.com/30207-30210-Steel-Single-Row-Taper-Tapered-Roller-Bearing-Metric-Taper-Bearings-p-1094422.html?rmmds=search

The classic, though, is the spindle through the wheel center, and a pivot bearing 'way above the
wheel, not a complicated bearing underneath the wheel. Steel pin in a bronze cup.