Lets see (going from memory):

lock washer is between the top bolt head and metal arm rest piece (soft pad is on top of that). Fat washer beneath arm rest (painted black) and another fat washer beneath the "other" nut that holds the bottom aerobar extension to disperse pressure. You can also use the little inch two piece that mounts the aerobar for this instead of a washer on the "extra" bolt. Mine is pretty sold like this, even honking pretty hard on the aerobars with lots of downward elbow force.

Lowers the front by at least 1cm

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Fatigue is biochemical, not biomechanical.
- Andrew Coggan, PhD