How are drum brakes adjusted in a Nissan Pulsar?

on the back of the brake drum (facing the middle of the car) is a rectangular rubber bung. pull that off and inside that should be a small spoked ratchet/gear/wheel. it will only turn one way and you have to use something like a small screw driver. turn it a few clicks and check the tightness of the wheel. continue test and adjust until brakes bind just right. dont do it up too much cos that will cause undue wear on the pads and loosening it off again is a way more time consuming job.