TOMAS":2xznb0tu said:
I always flip bikes upside down to do cranks and put my weight behind it that way.
Why? You should be able to pull a crank with the bike in any good work stand, there really shouldn't be any issues with stability etc. when pulling a crank as you are only putting pressure on the tool and the crank arm, levering them against each other. I would have thought putting full body weight behind it will just result in stripping the crank thread, so other methods will be needed to avoid that, e.g. tapping squarely on the end of the removal tool can help, in between tightening it, or if that is not effective then pouring boiling water over the crank has done the trick for me before. Fortunately I have not had an alloy crank with a totally stripped thread yet, but that would be one to take to an LBS if I wanted to save the cranks, as the thread will need repair in any case.
Oh and I always put a smear of copper ease on square taper BBs when installing cranks, then torque them down properly, and have never had them come loose nor had problems removing them even after several years.