Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,200
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Mentioned: 132 Post(s)
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What finally brought out my stuck/oversized steel post (after ~2 tons of pulling force alone wouldn't do it) was my beating on the seat tube while pulling.
I used the hammer shown and beat hard and repeatedly on the seatpost engagement zone, while pulling and using the block of softer TREX material as a buffer.
The seat tube and paint were unscathed and the post very slowly emerged from the seat tube as perhaps hundreds of blows inched it out.
Perhaps with a static twisting force applied (and held), and while beating on the seat tube, your post will break free(?).
I'm definitely going to try this myself the next time I am dealing with a stuck post!