I'll probably get strung up by the " small and furry brigade" for this but sure........
Quite simple actually.
Place Rodent belly down on hard flat surface. Place rod on back of neck. Push rod down and slightly foward till you feel the neck break. Thats pretty much it, instant lights out, I've been breeding feeders for quite a while and tried various methods before settling on this one. If I'm honest its not one of the nicest thing for me to do, but from what I've observed one of the quickest and most painless ways for them to go.