I used to use the original design with the MyFocuserPro as a controller. It was great but my new mount can controller a focuser but did not work with the 28BYJ-48 stepper (not a 2 phase stepper) from the original.

So i found a alternative motor (search for "Two-phase Four-wire Precision Motor DIY Robot Car 22MM Stepper Motor Metal Gear Planetary Reducer Motor"). It is a standard two-Phase and working well.

IMPORTANT i posted in comments.. I added to new files the FF ones. the original design did not give full range of focus (although often not needed). the new parts will cause a taller focuser/motor so be sure it an clear your camera etc.