I just collapsed my bumpers this last weekend. It is easy, just use a drill. I would caution you about just forcing the drill though. You will feel as is starts to go through and air will escape, and eventually oil. Once the bit starts to just pierce through I would stop, allow the air to escape, then continue to drill through. Once you have a hole, I recommend rotating the mount so the hold is facing the ground and use a catch pan and push it in. It might get hard, just allow the oil to come out then push a little more. Wear safety glasses too.