I had a triumph today - the seatpost on my current restoration was completely seized, tried heating and lubricating but no joy. Removed the saddle, sawed the seatpost in two and tried hammering the post downwards to at least try freeing it up, but still no dice even after giving it some serious beans with a rubber mallet. Resorted to taking the wheels off, turning the frame upside down and gently dropping the bike - seatpost first - against the floor. After a couple of slams, the post finally budged slightly, but still only slightly. Gave it another go but it went all the way down flush with the top of the seat tube. Cue the next dilemma of getting the post out of the seat tube whilst having no pulling purchase
Almost gave up and as I was packing up I glanced at an old quill stem! Luckily it just about fitted inside the seatpost and I tightened it up, put my frame in a workstand and after much twisting the little fucker came out!!!