I have a steel pole in my garage that helps support the 20 by 20 foot room above it. The problem is that the hollow steel pole is about 75% rusted out at the bottom and it is set into the garage floor. My question is how is it best to replace? Cut it off at the floor and bolt the new one on top of the floor or remove a section of concrete and either set the new one either into the concrete or on top? Any suggestions would be appreciated.