I'm looking for ideas. It's an aluminium seatpost in a steel frame. I've tried lots of force with the help of friends but no luck. I've been pouring in WD40 and riding rough roads with no seatpost clamp for a couple of weeks, same result. Someone mentioned Coca Cola, does that help? I'm stuck - figuratively and literally! Oh, one potentially complicating factor - it's a Thudbuster LT seatpost! Any advice will be appreciated.