Microscope Z axis

Hello Group A little bit different project. We would like to install a step motor on the Z axis of a large Leitz toolmakers scope. Its a older scope and needs a fine
focus adjustment for high magnifications. None is avail. to order today. I need help ? Is a stand alone controller with joy stick control or just a jog
and single step comand made ? I hate to use a pc whem we omly need a jog to get close and a single step mode to get our fine focus ? Such a
device as the " FROG" single axis control would be perfect but we need a motor of 200 oz/in or bigger to raise the heavy iron collum up an down
any ideals for a electronics challenged watchmaker ? Many Thanks



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