Our Franke Fragranite sink has arrived, minus instructions and one waste
trap.

So while these come, does anybody know the correct way to remove the blanks
for one of the tap holes. They are flush on the outside with a green sticky
label marking their place, but there is a insert cut from underneath.

Drill, punch or hole-saw look possibilities but I would have though going
from the bottom could cause cracking of the surface.

Thanks