I have the ground glass wand and have been having some trouble getting the screen in place. I know the instructions but I think I have some oversized screens. But here is the issue. Sometimes the screens get slightly kinked up and begin to fray a little bit on the sides after repeated attempts at getting the screen in place. Yesterday I was hitting the SSV and had some sudden chest pain. It was not a huge hit or anything, it didn't make me cough. However the chest pain lasted through the night and is still going on today. It's not severe and is not preventing me from breathing or functioning like normal, but it is irritating. Do you think I could have inhaled a tiny piece of the screen? If that had actually happened don't you think I would have coughed a lot? It's very odd to me and I want to know if it's something I should be concerned about. I decided to order some of the 7th floor glass screens and I am hoping they will work out better for me.