[Herodotus]

I don't seem to have any good pics but this year we used the front piece off of a scooter as our turret base, and then just attached a gear to it to turn it. Works well for something like an arm but if you are having a wider load such as a ball launching turret from last year I think something along the lines of a lazy suzy would work better. Last year we made our own custom sprocket so the balls could go through the center.