the armrest for my a3 has arrived ... i have drills, hacksaws and a fine selection of tools ready to do the job - but one thing is confusing me: how exactly does it fix??! i have the armrest, a bolt and a car. the bolt goes through the armrest and then into a hex-shaped hole in the centre console, but there is nothing for the bolt to tighten into as far as i can see. am i missing a nut-type part? or am i missing something really clever which happens?! another user has suggested that the bolt expands as it is tightened. this would be great although looking again at the parts i have to work with, i can't see how this could be the case. does anyone who has fitted an armrest to their A3 remember how the bolting works??! thanks for any pointers any of you may have. i have tools all ready and am gagging to get this fitted today before hitting the road!