How to make a TRP(Tension Release Pin) continued

Peg wins the prize.  She advised that I smash the head of the nail.  I did.  I got out my hammer and I smashed it using Steven's sledge hammer as the anvil.  It worked.

 My only concern is that the smashed head, while the correct shape, is a bit big.

It could interfere with function.  I must experiment with trimming.  Good thing those nails are cheap.