My bike's better than me!
Join Date: Feb 2005
Location: Northern Colorado
Posts: 2,041
Bikes: (2) Moots Vamoots, (1) Cannondale T2000 tourer, (1) Diamondback Response Comp mtb
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I would start by getting an OEM spec binder bolt. Try that.
If it still slips, then use the forum's search feature to look for ... slipping seatpost.
Good luck!