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Jonny69
The bonded section of the post came unbonded, so I took it out, drilled through the post and put an old axle in there. Then we could spin the post using the frame as a lever with the axle clamped in the vice. But there was no way of applying force upwards to move the seatpost so we clamped the g-clamps onto the vice and got one person to push upwards while the other twisted the frame back and forth.
The Freewheel tool was just enlarging the clamping surface of the g-clamp so it sat evenly on both of jaws of the vice.