I am new to this too. End of last year I tried a test with some 14.4v Argos drills on a test rig worked fine once unsorted out how to keep wheels attached. I used it as a proof of my skills and I have no intent to use that hardboard chassis, but the drill motors were impressively fast. If I use them for a real robot I would look at taking them out the casing and using a clamp to hold in place the ties suggested in the manual do not allow accurate alignment.