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aggi
Dunno if they should, but in my experience on both bikes I've got the blocks fitted to, they've both left marks/gouges on the seatpost (thomson alu in both cases).
I didn't go nuts overtightening them, just tightened them enough to stop the bag moving and had a layer of electrical tape under the mount as well.
I hate using a rucksack, and this'd be pretty much exclusively for a 28mi each way commute to do once or twice a week, so would prefer something on the seat tube/saddle than something rubbing my legs on the top tube...