(long time reader first time poster)
I just recived my Samsung Galaxy S 2 last night and wanted to make a stylus for drawing etc.
Most of the guides here are "big" and didn't have the precision i was looking for.
So i dicited to make my own :-)
What you need is 2 normal pens one with a spring that will used for parts.
The only thing you need to beware of is that the end of the spring don't touch the screen directly so it makes scratches - so bend the spring-end on top of the others.
You need to touch the spring when you use it.
I will maybe update the post when i have time but this is it for now - hope you like it. :)