I also forgot to mention that on top of the door frame where you will have to gets some steps to see it ,there is a small celindrical devive with an allen key fitting if you turn this slowly in a certain direction you should see it move backwards or forwards cause its in an offset hole this will tighten the door to the frame when you lock it ,,but dont over do it just turn it bit by bit and keep checking to see if the door closes and locks
tezza, May 2009