Clutch Centre & Mainshaft Nut Lockwasher, for use on BSA models: A7 & A10.O.E.M: 67-3253.BSA A7 & A10 Clutch Centre & Mainshaft Nut Lockwasher. 67-3253. G20FSKU: 67-3253£0.79PriceQuantity*Add to Cart