The N01/N02 webbing is a little thicker than our Heritage webbing. Once your strap bars are off and ready to re-fit, lay the webbing across the back of the watch with the buckle end of the strap coming out the top of the watch. Ease the strap bar through the watch case and over the webbing applying some pressure to press it into the watch case. To locate the strap bar in the opposite hole, make sure you apply enough pressure to squash the webbing so as to align ease the bar into the hole.
If you've tried and you are still finding it difficult, post it to us and we'll fit it for nothing more than the cost of the return postage.
If you are yet to order your strap and would like us to fit it to your existing watch, write us a note within the order page notes section or email us to let us know you would like us to fit the strap to your watch when it arrives.