last night I flipped my crosscheck upside down to take the wheels off so I could put some fat ritchey tires on and I hear this rattle. pull out the seatpost. nothing falls out. looked in the drain holes on the stays and there is a piece of steel floating around inside the non driveside seat stay. too big to come out the drain holes but too small not to move around. I can't think of a way to get it out. surly's closed up shop til the end of the month so they can ride in beerlin or I'd ask them.