[Merlin66 (Ken)]

JMI Digital Readout controller
Bought this recently for a spectroscope project which didn't go ahead.
http://www.jimsmobile.com/buy_motor_controls.htm#DRO Hand Unit

Even if you don't use the DRO option it can still be used to control the SW DC focus motors (and others)
My pain is your gain..Only $75 delivered. (Available ex-Melbourne after 4th March)