In
one of the previous posts I was wondering why my M96 stylus, my another fatter stylus, a pencil, a cotton ear bud or anything I could find around me did not work with i86 screen. The answer turns out to be simple - too skinny!
A marker cap works so does a microSD card

(careful not to scratch the screen though)
A plastic bottle neck ring demonstrates the way IR screen works especially well. Now all you need to do is to find an opaque ring like this, attach it somehow to a stylus and voila! You can scribble away