Old 02-09-12, 05:13 PM
  #6  
bhchdh 
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Can't tell from your post if the threads are stripped, if they are then there are good answers above. If they are not stripped I have two thoughts. The seat post may be the wrong size for the seat tube, or you may not be tighting enough. As a suggestion try some " carbon fiber assembly paste" on the post, it will add some friction and may stop the slipping.
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