Ok, I should have known that the finger pointing would begin.

Yes the washer is not there, my mistake. YES I practiced with these heads by tying with dental floss. They shot perfectly by the way.

My point of entry was an inch or two forward of where it should have been. No I did not hit the heart but yes the lungs.

So where was my failure...other then catching the edge of the shoulder?? Not having the washer in doesn't prevent the blades from opening. I can't agree that they would fold back in so nicely and tightly inside organ tissue.