Phew! That was a struggle! My friend and I managed to get my seized seat post out. One of us twisting the frame whilst the other pushed upwards whilst it was held in a vice. Boiling water was poured onto the frame to try to expand it. It worked but it was a lot of twisting back and forth. The post was burried 6 inches down in the frame. After looking down inside the frame I could see corrosion below where the post had been.