You could do a search for "manual setting circles" here, google or elsewhere; or alternatively have a read of this CN thread:
http://www.cloudynights.com/ubbthrea...l/fpart/1/vc/1
No need for encoders, just a large degree scale for Az, an angle finder of some kind for Alt and a PDA or your laptop to get realtime alt/az coordinates.
Very effective solution while you save for the Argo..