mirage speaker connections

speakers have clear plastic binding posts that should accept bananas but black rubber blocks the hole. What is it that I need to do?
Should be a simple answer as many models have this.
you have to pop the rubber out...
Take a razor blade or thin flat screwdriver and pop out the
black plugs. The EU made speaker makers block those holes
because consumers were putting the AC power cords into those
holes. Really, I'm not making this up. Google "EU bans
banana plugs".