With joints? I have trouble with this too. Maybe if you imbalance it with a small phased object inside a ring. Visible boundary rings from script brains are what I've been spinning lately.
Thanks for the input. I'm starting to figure it out a more, using Nokyard's motor system. Now I just need to figure out the scripting for the starter mechanism.
I haven't needed to script the motor ever. Just use an invisible gravity volume. It's gentle and doesn't break it. No script required. Just put it outside the playspace.