Evening all,
In picture 1, you can see the metal leaf on the ratchet on the right, on the left you can see the spindle, below this you will find a square with 2 notches one end of the arm will fit into this.
Picture 2. This is the arm with the spring, I have attached alittle glue to the hook end to stop the spring coming off, when inserting under the spindle and a tie to the spring to help pull it out.
Picture 3. Here you can see the arm inplace in the notches, and under the spindle.
Picture 4. Here is the end result, the spring has been as seen pulled up, with the aid of the tie, then the loop of the spring has been pulled up and hooked on the hook, notice the 'A' this is also in the kit with a screw, this should be screwed into place before hand.
This is how I carried it out, just like Dave I believe.
I hope this helps.
CP