PDP alternative to ball screws is made of two ground WMH pinions connected through a preload system to reduce rack-and-pinion mesh backlash. When mounted at the output flange of SRP, a high-tech planetary gearhead, PDP offers four different modules with straight or helical teeth, eight reduction ratios, angle-drive versions, two-output pinion diameters for each size, and an input interface in-line flange or with a 90° angle.