Voilà—our cables have been successfully soldered to the new tweeter unit. Good thing we had thought in advance about replacing the insulating ring before the cables got re-attached.

Let's proceed by first placing the ring inside the recessed surface inside the respective cabinet area.

Alternatively, one can place the ring right onto the base plate of the tweeter unit before re-attaching it to the cabinet.

Whatever the approach, make sure that the gaps in the ring are flush with the respective holes in the chassis.