Checked under my sprocket cover today... what is this?

[Disorderlypunk]

the gaps are only there to locate the two locking bolts that is used on a different type of sprocket retention system - luck may be on your side and the gaps line up with your nut edges but luck of the draw is never incorporated into design
(except on the mrs punks scratchword scratchcard, if it gave us a S or a T at the end we would have been rolling in £300,000 that was designed bad luck)