Originally Posted by
madpogue
They are anti-slip devices. In this case, mounting the stop above the braze-on would do nothing. The force on that stop is upward. The force on a stop (or shifter band) at the top is downward.
They would only be “anti-slip” if the clamp were very, very loose. Most of the time, the clamp is tight enough that the clamp won’t slip. Even if they were meant to keep the clamp from slipping, a clamp would rotate if it hit the point of the heart. That’s not going to have a good result.