I understand. Ask Terry his email is at the bottom.
http://yourduino.com/LearnArduino1.htm
Other than this design, is there another cheap source with gears? I have some with 16:1 that look the same from the outside. How can you get 4096 steps without gears? If speed is not a concern, even with backlash, how can you beat it? Most cheap steppers are about 1 deg/step?