I see, well yeah that's obviously better ^^
I thought that once the motor shaft is not engaged the middle gear, when manually rotating could rotate the focuser, and I think it will work, but completely useless 
That sounds pretty awesome, the only thing I'm worried about is backlash when changing the motor direction, if I recall(might be completely wrong), these types of gear tend to have a lot of backlash?
Thanks for the help!