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@coventry_eagle
Same here, refuse to be beaten!
Plusgas just arrived so will give that a try next week. Hoping that will get it out. Will try a hybrid method, fill the seat tube with plusgas, and immerse the bit of seatpost sticking out in ice/dry ice and leave it overnight. Hopefully the seatpost will contract enough to let the plusgas seep through. Replace ice the next day and give it another hour or two, clamp seatpost onto vice, pour boiling water on the outside of seat tube and a quick yank.