Mealworm farmers usually use the green bucket sifters from Amazon (tinyurl.com)
My round sifter inserts were designed for these green trays. But this video shows a neat trick that helps you bypass the green sifters altogether!
You can purchase the round sifter inserts here:
https://www.spacecoastmealworms.com/collections/round-11-pupae-sifting-inserts
music, as always, with permission from davidcuttermusic.com