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Not sure if I can explain it with just words - but here goes.
The pin goes through the hoop on the spring. The spring itself has 2 legs on it. The smaller leg goes forward and hooks around the pedal brace. The longer leg goes upwards, and hooks around the assembly arm itself.
So basically one leg pushes against the pedal - the other leg pushes against the arm. The pin goes through the spring loop to keep it all in place.
I don't have pictures of mine.....but used these instructions (with pics) to install mine a couple years ago: