Originally Posted by
striegel
The cure for the Dahon slipping seatpost is to remove the turtleneck clamp, pry out the shim that sits inside the seat tube and grease the outside of the shim, then re-install.
My 2007 Mu P8 suffered from the problem from the time it was new until I followed this advice. Before trying it myself, I could hardly believe it would have that much of an effect, but it really works. Apparently this helps even out the force of the clamp around the seatpost instead of concentrating in only a small part of the surface.
My Mu P8 is 2007 as well, I tried to grease the shim and honestly I have tried everything I could and just gave up, the Mu is a great bike but mine could be defective. The Dahon dealer suggested me to return the bike and get something else, the thing is that I got a great deal because it was the 2007 model and for the 2008 I will have to pay the difference. On top of that, the Mu P8 is out of stock and they won't be getting any this year... So the bike is ready to go back to the dealer, yesterday I had removed the bicycle computer, the bell and the wedge bag. Too bad I really liked this bike and the color is so sharp, it's sky blue.