First of all, according to the pattern of your balcony, measure the distance and installation position of the four pulleys, and draw the hole position with a marker. Punch holes in the holes drawn, and knock in the expansion screws with a hammer. Install four pulleys respectively, and then install the corner device.
Then there is threading. Pay attention to the threading steps. Firstly, two ends of the steel wire are respectively inserted into two grooves of the wheel of the corner device.
Then, install and fix the hand crank on the wall vertically below the corner crank.