I am look for a ah, well, you see I don't quite no what to call it. The drive mechanism for a stationary lead screw design. The whole assembly (including gearing) between the stepper and up to and including the (hopefully anti-backlash) lead nut. I don't know what to call it nor do I know where to find it. Any suggestions for COT equipment of this sort? Or am I stuck with fabing it up myself?