Just a simple kazoo. You have to add a piece of plastic wrap into the hole, put the washer on top and screw the lock into it. If some of the plastic wrap is looking out of it, you can just rip it off
oh yeah, right, forgot to add to the description. You actually have to do it. You can put a small piece of plastic wrap into the hole and screw the other piece into it. Now you can just rip the rest off, the needed part is safe inside