OK let me try to get your understanding here.

In the clamps as with all Exile series tower speakers the wire comes from the center of the clamp and designed to go right into the mounting tube. So you drill the hole in the tube directly where the clamp goes.

Now on the Clamps for boats with tower diameters my size i have more room and there's a small air gap in the clamp where it connects to the tower.

On the Smaller OB size tube diameter in order to make it fit the tower boar they had to shave all this extra material off so the clamp is much smaller and literally flatter.

This is why you have no air gaps big enough for a wire.

There is no special wire connection threw the side of the clamp or anything its simply i have a larger tower bar so there's more room in the clamp when it closes over my tower.