Forward Gear Fork Shaft Bush (3 Pcs) For 105-135 Gear Box of 4 Stroke (178F, 186F, 188F & 177F) Power Tiller is a set of precision bushings designed for stabilizing the forward gear fork shaft inside the gearbox of 4-stroke power tillers (compatible with 178F, 186F, 188F, and 177F engines). These bushes minimize wear, reduce shaft play, and help ensure smooth gear shifting.