I got a swedish army trangia today which is great...already used it to make a cup of tea. I've checked rest of the forums and found the excellent tutorial to use it but I can't work out how to put the thing together properly. I read something about putting the hook into the second notch so it doesn't rattle. I can't work it out. Do they all rattle or am I being dim? Is there a way to 'lock' the windshield onto the main parts for ease of carrying or does it always come away? Any advice would be helpful. Sorry if I'm being dim.