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the only way is to wind it out while pulling. whacking it with a hammer won't work.
The trick is to ensure you're applying force in both directions at once - if you can only twist the post, you need to either apply a constant pulling force while twisting, or at least find a way to deliver some taps or whacks while twisting.
So whacking it should work, but only if you're twisting at the time
bigshape
se1derful
Kimmo
I really thought I'd beaten this seatpost.
When I wedge the post in the storm drain on the road and twist the frame (don't have a vice) it now turns.
I really thought that when 'I broke the seal' I would be on the home straight, but I still can't remove the post from the frame-set. Tried belting it upwards with a heavy hammer using the clamp area. I'm getting a solid contact but it just won't budge.
@lynx it's a steel frameset, alloy post.