removing broken dart shafts

[ChroniC]

I have 2 darts with the threads broken off below the metal sections. Its very hard plastic and have tried scratching a line into it to, to see if we could unscrew it to no avail. Ive tried melting it out, no luck.
Any quick answers as i want to use them now

 

[ChroniC]

Yeah, forgot to mention im at university halls, and tools are scares. So makeshift removal is needed.

 

[ChroniC]

plastic bearly melts, its damn hard stuff.