You mean where the leads go? There's a rubber grommet and pin at the bottom, the pin is the positive contact and the grommet separates the two leads. One lead stays outside the grommet and one goes
through the hole in the middle of the grommet and is held in place by the pin, excess is clipped. Make sure the leads don't touch on the way from the coil down.
There should be a couple of videos on YT showing in detail how it's done with the OCC (I'd search "rebuild Kanger OCC"), I'm just describing in general how most of the commercial coil heads work.