Clutch Fork Shaft Bush (4 Pieces) For 105-135 Gear Box of 4 Stroke (178F, 186F, 188F & 177F) Power Tiller, E12857717 is a set of precision bushings used for aligning and supporting the clutch fork shaft within the gearbox assembly of micro tillers equipped with 4-stroke engines (models 178F, 186F, 188F, 177F). These bushes ensure smooth movement, minimize friction, and extend the life of gearbox and clutch components under demanding agricultural use conditions.