This is how I've done it and how I'm going to improve it.
Also use loctite.
That's smart, but doesn't that create a (big) moment of force on the bolt? Would be afraid it could snap when the rack is loaded.
I think shear loads for M6 A2/A4 bolts are significantly higher than the loads would be on a rack rated to 15kg, also given that load isn't bearing down perpendicular to the bolt because of the mid-fork eyelet.
@Tijs started
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This is how I've done it and how I'm going to improve it.
Also use loctite.