you mentioned weight here
"To start with you need some mung beans. this method will work with any large seeded sprout, the smaller the seed the less weight you need on top." but in the post you don't talk about weight besides like the top fabric. can you clarify if that's the weight you're talking about or if we need additional weight?
In the photo, it looks like the fabric you're using is like a yarn sweater. Can you clarify if for example just normal cotton would work?