Many years ago, the guides and stops were part of the bike. According to Dave Moulton, it was Colnago that decided that brazons were bad. Their stated reason was that the heat weakened the frame. The real reason was that their build cost went way down without those pesky brazons. The first brazing I did was to add cable guides and canti bosses to an old Peugeot to turn it into a cross bike. The frame hasn't failed, the canti bosses haven't fallen off during braking, the world hasn't ended. It's just metal and fire. Like I said before, it ain't rocket surgery.