Cheers CB. I'm not sure how the sleeves work, but if I was adjusting on the engine sprocket, it would have to be nearer the inner primary rather than further away. My logic says that if you make the oil seal sleeve thicker, it'd move the sprocket away from the inner primary cover rather than closer to it?? As it stands, the chainwheel is too far in or the sprocket is too far out (by around 3-4mm)