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I'm using soldering iron. But I'm getting the use of it. All i need now is a flux and M-seal instead of shrinkable tube.
Guys, I know how to do it. It's only a noob problem at this situation but I got it figured out. It's just the tip end of the iron was pointy, thus making a less heat. It's all settled for now. Thank you for your cooperation. All I have to do is repair my 2 sets of headphone: 1st one is the jack problem and the 2nd one is jack and headphone speaker replacement with a better one (sound quality). And also what's the commercial name of M-seal, you M-seal is a brand so what it is really called. I found on google and it says epoxy putty. Is it? And do I really need a flux before joining the two wires with solder. Do I have to sand paper the wires or burn it with lighter so that it'll be easy to solder them without these tiny fibers?