Permanent Refugee .......
Join Date: Dec 2005
Location: Okanagan Valley, BC.
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If you are using a newer style bike seatpost collar as opposed to the seat lug style of years gone by, do this.
Take the collar off the bike and take the binder bolt out of it.
Put the collar in a vise and with a fine toothed file, file away some of the collar where the two ends join. Often times the end of the collar that gets "pulled in" is too long and the result is that even though you have tightened the collar, as much as it will tighten, you haven't actually tightened it down on the post since the two ends of the collar are meeting.
I have had to do this with FSA and CAmpagnolo collars.
Always works for me.