Detailed information about extensions in various mechanisms in different types of machines is provided based on the movements of the extension of one tooth from the other, and the accumulation of these details. Extensions are divided into working (frictional, slotted) and connecting extensions based on the movement of the extensions. If the extensions are parallel, cylindrical toothed wheels driven by a balance shaft are used. If the gears are to mesh, conical friction wheels are used. Extension by the movement of the connecting extensions based on the movement of the extension is provided