Old thread, but I thought I would add to it. I thought one of my RN4072 atties was dead. Nope, just needed to "stab" it with a sewing needle lol wow, perfect. Works almost like new. This particular atty is my favorite too, so it was disappointing when I had to put it away. It has a stiffer draw than my other RN4072 atty, so I'm glad it's back in business.
I did have a scare while doing this though. I put the needle in, pushed to the side and felt resistance and thought "there's the mesh, push it aside" and I looked into the atty and it was the coil I was pushing aside. I thought I killed it, but it went right back into place.
Be careful and keep an eye inside the atty to be sure you aren't trashing your coil.