Wow. My center stand pivot pipe was STUCK! After cracking that thing with a hammer and socket for about an hour. I let the ol PB Blaster work its magic (for about 5 days), but it's spells were rendered useless. So I took a drill ( a big mfing drill bit) and drilled out the center of the flange side and hogged it out until the pipe's walls were thin enough to take a chisel and screwdriver to fold the material inwards. That made it possible to clear the bolt mounting bracket and then the other side just pulled out. Holy hell!