I'm a fan of this, and much prefer it to thru-hole mounting that lets the bolt/nut assembly rotate under vibration
But don't use button heads! Hex-head bolts are by far the better low-profile fastener, and these are still available for ballers
Campagnolo Bolts and Washers - set of 8 - Sale! (and you should already be carying one of these badasses:
Park Tool Co. » MT-1 : Multi-Tool : Multi Tools )
No washers for shear loads! Watch the video:
Video on a Junker Fastener Vibration Test
The added surface area helps, but you can get that with hex or flanged heads without the dramatic self-loosening under vibration
Just as long as they get replaced every so often — they're much easier to put on the second time, and wear to nothing over many uses
Safety Wire is the big boy solution
Our recent racks have all used breezer dropouts at the attachment points, and the next step is to start drilling them for wire
If you look at the special hardware that Shimano includes with their disc calipers, caliper adapters, and XT 6-bolt rotors, you can find a LOT of inspiration there
indeed, but if you avoid stainless and especially unrated fasteners, they really don't want to shear even under abuse
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