Questions about Spinners.

1st question: I keep seeing Beamng car destruction videos showing a spinner connected to a wall via the node grabber, but I cant seem to nail this correctly, any help?

2nd question: In another destruction video, I see the spinners intermeshed, kind of like gears, and spinning without hitting each other, how can I sync them up like that?

 

I've seen maps that spawn objects like spinners once you load in them in freeroam, maybe the ones you've seen in walls have to do with that. As for the second question you could put the spinners at the apropiate fase angle, then pause the game, start both of them, and then unpause. That way both start at the right angle and should have the same velocity at all times, so yeah syncroniced.