If you have a bow without the hole you could drill and tap it yourself. If that is something you would not be comfortable doing yourself, take it to a machine shop. I know I've done bunches of little things like that for people that have come into our shop free of charge. Even if you had to pay, one hole shouldn't be that much. I would recomend using a helicoil insert but you wouldn't have to, if you ever needed one you could add it later.