In theory, the tape is set up so your thumb slides over it and does not engage the safety button. If the problem is mechanical, it should pull the safety back as the tape isn't going to be stuck so strongly that the safety button cannot move. You see, the safety can move but not be moved "inadvertently" by your thumb which is intended to slide over the tape. I guess you could make it even more interesting by putting a matchbox or something over the safety like a little shelter and then applying the tape.
