I have a tiny little dartboard where most of the original darts got lost over the years - so here's the replacement, converting a simple pin into a miniature throwing dart. An M3 nut serves as trimming weight which is also locking the pin. I did it with three fins just because most darts have four :) Don't be surprised, it really IS tiny.

If you intend to use this against people or animals, or use it to make your little sister cry by blowing up her red balloon, you are indeed a very evil person.