Okay, sorry for being snippy. I read the article, and I see what's going on. I thought of PLH as a part of the disc, like the wing or the nose or the rim. Really, its referring to a characteristic of molded objects.
Still, the article is merely explaining how you can use PLH to determine how to compare two discs from the same mold. I don't think I'm wrong in saying that stability is caused by a number of factors, and you can get a good idea of how a disc will fly before you've even thrown it, and one factor is the height of the nose, which I was calling PLH.
And if you haven't put the three Nuke molds on a table, you're not going to see what I'm talking about. You could also set all of Prodigy's fairway drivers down, and the difference you'd notice is the curvature of the underside of the wing, that's how they changed the stability across molds, among other factors.
And since this whole hoopla was about beads to begin with.... Yes, a bead is a design characteristic that is intended to do two things: First, to create a "feel", which some people like, and some people don't. There is a video, I think its the one with Feldberg and Climo, "Learn to Play the Champions' Way", where Feldberg explains to set the bead over the crease under the first knuckle of your index finger, he says, "That's what the bead is there for".
Secondly, a bead is going to add stability to the disc. That's not to say overstable discs MUST have a bead, or that understable discs CAN'T have a bead, after all, an Innova Wolf has a bead, and its stupid flippy. But one could assume it would be SUPER stupid flippy without the bead.