3.
Visually check from below that the notches are suitably placed against the rung.
Once this has been done, the positioning of these pre-cut notches no longer needs
to be changed.
4.
Position the second plate so that the pins align with the larger locking holes in the
first plate. Push the pins down through the larger holes and then slide the plate
outwards so that the pin is locked into position in the smaller segment of the
locking hole.
Below you can see the view from underneath looking upwards, firstly of the locking
tabs unlocked, and secondly of them locked in position:
