Mark,
If you only want a low-cost light-duty rotor for a 2-meter beam, even a
bayed array, I'd recommend a TV rotor.
I think anything larger than a VHF antenna would be risking the capabilities
of the rotor. Some of those TV rotors had a directional indicator knob that
you turn.
Alliance used to make one with a worm-gear that was pretty decent; and the
box was almost silent when it was turning.
Steve, K8SP