I was thinking about the, let's call this "PDI SCS nub", and I have a new idea. My idea is based in the Pikatchu/hari design, but with one difference, instead the rounded surface, we need a straight one. I mean, if we want to get the finnest performance with that chamber, we need to use the dual hop bar in some other way, using a 2 part nub. The stability problem is not really hard to solve. If we put a large surface in the top of the dual SCS nub (lubricated to get a good fricction) and the reversed conical (straight instead of rounded, I will try to draw that latter) in the bottom, we had the 2 point hop up we want.
The continual point we had with the SCS in the 1 hop bar chamber, is not the best with the 2 dual bar. If we always have the SCS touching the max surface of the bb (with the bucking in the middle, but lets imagine the bucking doesn't exist), we can't use the left-right correction, because the bb is going to be pressed all the way (with a 2 part rounded we can use it, but is going to be innacurate because of the not gradual curve) always. So we need an H nub bigger, but with straight surface to have full control into the trajectory of the bb. One that could press in non-simetrical ways.
Is not paint, but something to know what I'm talking about.
The big SCS : "-|X|-" with rounded surface
The 2 part Picatchu/Hari design: "-|> <|-" with rounded surface
The 2 part I talk about now: "-|> <|-" with Straight surface
I hope the ones we are talking here understand the idea.
Of course the best is to do the 3 (or 4 or 5...) designs and see which works the best in the same gun (and try with Firefly bucking and with regular bucking also). As you should now, theory and reallity doesn't match too often in airsoft.
Lo traduciria...en serio, pero es como hacer el trabajo 2 veces, mañana lo edito si tengo ganas.