The ideal transmission choice is when substantial transmission reduction is needed. A worm equipment is comparable to a helical gear with a throat lower to boost the outer diameter of the wheel. The throat permits the worm equipment to wrap completely about the threads of the worm. By reducing the threads on the worm instead than the teeth, and by altering the number of threads, different ratios can be achieved with out modifying the mounting arrangement. A exclusive attribute of worm gears and worm equipment assemblies is their capability to prevent reverse rotation.