De Rosa, stuck seatpost

I'm a suspicious type, I reckon the seatpost man uses temp difference and the "specialist tools" aren't the key to the job just to make his life easier.

Re frames cracking due to liquid nitrogen could this happen with a steel frame? Again being a suspicious type wouldn't the seatpost man obviously say it's dangerous, especially if it's the very method he uses?

I can't see how he can be using tools, specialist or not, that don't cause some damage.
There are only 4 methods as far as I can see.

1. Chemical erosion either complete (sodium hy etc) or partial, ammonia / coke etc.
   
2. Mechanical / force, puller or hitting it in further to loosen the bond.
   
3. Controlled destruction of seat post. ,i.e. cutting it out or reaming it out
   
4. Temp manipulation.
   
   

Is there another any other method that doesn't fall into one of the categories above?

I better head over to the conspiracy thread!!!