Cut 15lb Mono and thread though your favourite bead. Melt one end up to the bead. Melt about 1cm.
Choose the distance between the eyes. Depending on the fly the gap is usually about 5mm. You'll have to experiment a bit.
These tweezers are sprung so hold the nylon by themselves. Now you can see both ends have been melted down. (Careful not to breathe in the nylon fumes.)
The finished eyes ready to tie in.
The great thing about this way of tying eyes is that there are so many colours of beads, they are relatively quick to make and the result is quite natural looking.