The following component was the reloading threaded rod assembly, which includes bearings, a gear and means to attach them in a reversible fashion. In addition to the motors, the cheap hand drills also provided their (cca. 10:1) planetary gear reduction, and one of the metal gears contained was used in this assembly, while another serves as an intermediate gear that couples it to the main motor. The gear was hand filed to a square interior slot, and the threaded rod ground to the corresponding mating shape. Other diameters and threads were also created for bearings and nuts.

The rolling nut was constructed from a hardwood cylinder sandwiched between two M8 washers and rolls on an 8 mm pipe. Slots were cut using a hacksaw and then filed.