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Using Co2 from fire extinguisher to remove seized seat post by freezing it

I todays video I show our attempts to removing the stuck seat post, actually a dropper seatpost from the carbon frame of my bike. We had tried a bunch of things including boiling water and WD40 but that didn’t help, perhaps the addition of extreme cold will shrink it enough to make a difference? So I bought a CO2 fire extinguisher in a final effort to get the seat postout.