A Wierd one to use, but I found that the negative side of a AAA Battery works. You can also cover the AAA Battery with one layer of electrical tape. A tiny stylus
Thought I would show one that I made, works great to!! The only thing I would suggest would be a screen protector i have one on mine so it's no problem for me. It doesn't leave any scratches neither so thats a plus and looks cool to. P.S. I don't use it that much other than for painting apps. Prefer to just use my finger most of the time. I just made it because i was bored at the time and wanted something to do.