This is really hard to explain, and i'm ashamed i know how. we always use(i think it's the right name) a cutoff wheel and make a notch in the end away from the plugs for the wires. you notch in until you cut a copper wire. you can widen the gap if you like, no real point to.
remember, you cut the square edge, not the rounded one.
i can send you a pic if you need.
and just so you know, these new super 9s suck compared to old ones.