Saw the seat post off horisontslly and then carefully stick The saw down vertically and saw CAREFULLY towards the seat tube until you almost touch the actual seat tube.
Sharpen an old screw driver and chizzle out the last bit where you've sawn.
Now clamp/ queaze the Seatpost so it collapses and pull out.
Does that make sense... I've had a bit to drink, but it worked to get a stem out for me.
Do you havE a jig saw?
If so put a hack saw blade in it.
Saw the seat post off horisontslly and then carefully stick The saw down vertically and saw CAREFULLY towards the seat tube until you almost touch the actual seat tube.
Sharpen an old screw driver and chizzle out the last bit where you've sawn.
Now clamp/ queaze the Seatpost so it collapses and pull out.
Does that make sense... I've had a bit to drink, but it worked to get a stem out for me.