Hi All,
Not sure if there is another post on this. But this is my contribution. Hope this will help someone here who needs to change his/her strap in to a Nato/Nylon Watch Band
1)

First remove the push pins of the watch with a push pin tool.
Then put the push pins back on the watch. Cause we will be using the original push pins to fit the nato strap.
2)

Open the Nato Strap
3)


Insert through the top push pin of the watch and then through to the bottom push pin as in picture
4)

Follow the image to put through to the other portion of the Nato Strap
5)

Completed Nato Strap on my Rolex Submariner
More images of the Nato on the Rolex



Enjoy!