After several recent experiments with lead placement I've noticed that it can be far more effective to focus on head lead placement relative to string bed pattern and physical head shape than the traditional clock-based hoop location. The difference is more or less important depending upon the area we're talking about. In other words, 12 is 12 whether were talking about head or string bed. But for what so many call 2/10 or 5/7 there seems to be more value on focusing on the string bed pattern rather than the head. For example, it seems that lead placed at the "corners" of the string bed has a more significant effect on feel that what might be the 2/10 clock position. This is more important if you're trying to limit weight and get the most bang for your mass. Even 3/9 on the head and the string bed are not "co-located". Depending on head shape relative to string pattern the string bed 3/9 can be higher or lower than the head 3/9. And even the head's 3/9 position (as defined as being the vertical center of the head) can be different from the head's widest point which matters since the farther the lead is from the center the greater its effect on stability. Is there some research or technical document that describes in detail the effects of lead beyond mere clock positions? I'd like to learn more about lead relative to string bed pattern and head shape rather than just "clock position". It really seems that the physics of lead placement is driven by its relationship to the sting pattern and head shape.