Hi all. I have installed one of those spring automatic door closers but i cant seem to fine tune it properly. It is installed as in this picture Now, i can adjust the speed at which it closes fine, but what does the latch do? Also now installed it takes a bit of strength to actually open the door meaning the kids are having trouble with it. The main arm from the spring mechanism is at 90deg to the door then the upper arm has been extended to meet the mounting point specified in the overlay diagram provided on the door frame. How would sliding the upper arm to the left so it overlaps with main one from the spring effect the strength required to open? I see vids on youtube of it being done that way, but the overlay says different. Thanks in advance.