I'm trying to carry it to hardware. You said that i should look for the teeth number. I have done a preliminar test, and got these numbers (gears are double spur gears): pinion - 13, gear 1 - 29/13, gear 2 - 39/13, gear 3 - 37/13, gear 4 - 37/13, shaft - 48, but as i said, i have space...