Does anyone have any experience using this? I bought a class set for a simple introduction to electronics as there's no soldering required. However, both myself and another teacher can't seem to get the bloomin' thing to work. The instructions supplied by rapid are not clear and we can't work out how you make the switch. From the looks of things the LED slots into some plasazote foam and the button cells go in a space in the middle of it. Any help would be fantastic please as we are just about ready to pull our hair out! Thanks in advance.