Use a sharpened pencil. Wax it up with bow string wax and poke it through the middle of the string.

After you get them where you want them, then you have to tie them on, or they will fling off.

Do you know how to tie serving? I' m learning on my own with trial & error, as there isn' t much information out there about tying servings. How to start and how to knot the end.