Yes you can give the rest safety holes in the air cell. It can be difficult to drill through the shell. I find it easier to scratch an “X” pattern back and forth until I have weakened a spot, and then twist the screw to make the tiny holeI tried to twist a tiny hole into the bruise before I had to leave for work, but it was very hard and I was nervous about applying too much pressure. I’ll work on it again once I get home tonight. As far as the other ones, should I attempt the same thing?