Thanks everyone for your help and advise. There are so many alternatives and my current method of a brass punch and a plastic disposable eve dropper to grip the post works great. I do own several of the Amazon type that may or may not fit well on the detent of the sight post. I just happened to like the one in the video. I agree with hdrolling above and think there may have been some kind of issue with manufacturing and maybe it was a one run and done sort of thing. I understand S&W did supply a key with some rifles.