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@C4r1s
Posted in the Holt my beer thread but probably also relevant here. When fitting a (rear) rack and either worried about the bolt working loose or sheering off under heavy load you can do as round the world tourers used to do and thread the (longer) bolts in backwards so the head is on the inside of the frame then get a nyloc nut on the outside to clamp it all together. Means you won’t lose a bolt, and if in the worst case it shears off you can still get the bolt out and replace it as the head is on the inside attached to the frame and not lying in the dirt.