DESIGNED IN UK BY VELO FELLOWGCM121 Clutch Locking & Adjusting Tool.  This tool is used to help adjust your clutch when fitting and adjusting the assembly.  The larger end fits over MAS167 which is the clutch spring holder and the slot fits over the crankshaft.  This means that the spring holder is held in place as you tighten the sleeve gear nut.   Once the sleeve gear nut is tight the other end is used to tighten the shock absorber spring collar nut.