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I don't know if this has already been mentioned or asked (tl;dr), but doesn't that mean that you use a high shear force to achieve a relatively low normal force? And doesn't this shear force eventually result in a "track" because the screw will kinda like work it's way into the rod? Even if the rod is hardened because hardening often goes alongside with lowering friction which makes you need more shear force for the same normal force. Sounds like an optimization task...