Five or six a year I'll take the bike up to Donington Park and have some track time. I love it. But because I always go down a tooth on the front sprocket for the day, and the sprocket nut always tightens up to the same spot on the transmission shaft and can only be used once as the lip area is weak and only designed for single use, I could spend £140 a year on nuts. I looked at cutting some more dimples on the shaft to allow the nuts to be reused, but couldn't get anything in as access is tight. Nor do I have access to a surface grinder or lathe to shave a gnats cock of either the nut or the spacer that sits behind it, that would allow alternative dimpling positions. An option is getting some shim steel and cutting a shim/some shims in order to move the dimple points around a little. Other suggestions are welcome on this one.