It's honestly not that huge of a secret. I just thought it was a great idea when I thought of it x) I am positive I am not the only person to use this method.
All I did was take some screen from a old reptile enclosure and made a sift out of it. I tested it out on the couple tiny nymphs before I took it out for testing and it was the perfect size. While I was sifting at this spot I found 20-30 hatched ooths and they were all found within 10ft of eachother and they were 30ft above a stream/waterfall on the side of a canyon/hill.
I will go out again soon. I have a meeting at work on Thursday and the spot is right around the corner so maybe I will go then