timb34 has the right idea... oh that and carbon paste but if you dont have that to hand just lube the cam on the clamp & give that a try.
seat post slipping - am i going crazy - its making me mad!
I had the same problem with a Thomson post. Changed the QR for a bolt up and it still slipped, to the extent that I had to stop repeatedly during the Selkirk marathon to put it back up.
Stuck some toothpaste on the posting around the clamping area, bolted up the clamp silly tight and it hasn't budged since.
Remove the clamp and clean it thoroughly?
toothpaste - thats geinus
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