Jared is correct, the lazy susan bearing cannot handle the pivot function for a top mounted module like this. These bearings are relatively light sheet metal made for thrust load only. With the side loads and impacts you will see in FRC they will fail quickly (the sheet metal races that contain the ball bearings will fail and separate.)
Look at this recent thread:
http://www.chiefdelphi.com/forums/sh...=swerve+module
It shows some mounting styles including our own. For modules with top support only, this support needs to be especially rigid and strong. Most module designs use lower support to avoid this difficulty. I notice you have a tall stem feature on top of the module. Could that be captured in a pair of bushings to form your pivot?