CML - I have a Krome, given to me by a very good friend, thanks, D.W. In perfectly clean condition when it arrived, but I wanted to get to know it well before using it. So I completely dis-assembled it for a cleaning and lubing of parts with Badger's airbrush lube, "Regdab," really a good product.
The little tip was not wanting to come out easily, so I used some acetone and an overnight soak, still didn't want to come out. Finally I used some very miniature tweezers with narrow ends, placed some contact cement on the insides of both ends and let dry for about 30 minutes.
Placing one end inside the tip rear, the other on the outside, I lightly squeezed the tweezers and gently rocked the tip side to side, while lightly pulling back at the same time. I could soon feel some slight movement, but it wouldn't quite give up.
Back for another soak, repeat the tweezer attempt, out it came. No damage to the tip, the contact cement is enough protection aganst metal damage.
Not to preach, but a thorough breakdown of at least the front bits and a good cleaning after each use, prior to storing, I consider an essential part of airbrush maintenance. Thinned paint has a way of getting into some mighty small places, when dried it can be difficult to clean it after some time.
Since you ask, a definate NO to the torch method.
Hope you get this sorted quickly.
Patrick