That seatpost is going to get scratched up from moving it around. Bike makers can't expect them not to, so I'm sure they take that into consideration. Aluminum seat posts get scratched up, too.
I had the same problem with tightening the clamp on my mountain bike. It had a quick release. I think I'd have it tight, but my weight would make it slip down. So, I had to resort to getting it tight as I could and then using my foot to close the quick release. My husband, however, could easily close it with his hand, so I know I wasn't tightening it too much. I'm just weak, is all.
If I had a carbon seat post, I'd be afraid to let him tighten it down--the big oaf doesn't know his own strength. But I'd crank on it as much as I could to get it tight enough to keep from slipping.
I've also heard that some people put electrical tape around them to keep them from slipping, too.
Karen



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