Airco Cutting Torch- tip removal

Usually you can leave the nut in, just loosened good, and give the back and/or side of the head a sharp rap with a small hammer and the tip will pop out. If you got the tip and head hot and then tightened it again (say, to correct backfiring after a preignition) you may not get it out that easily- heating the head while the tip is in cold water might make the difference.
Have you used this torch before and do you know it to be good? If I remember correctly, that tip has two tapered seats- if someone dropped the torch on its head, that can result in out of round tapers and a stuck tip. Hitting it in the wrong place with the intent of getting a stuck tip out can do that too, careful with the hammer Eugene..
Good luck with it,
John