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Useless part, the screws and the tabs that goes thru the front plate are enough to prevent movement.
The problem lies on the vertical plates and the best to do and you will be glad if you do is to mount a 1/2 x 3/4 rectangular aluminum tube along the vertical plates with 3 screws and that will prevent the tiny vibrations along the plates, also need one on top with 90 deg. brackets to really stiffen the machine. See what I did http://www.thingiverse.com/thing:2148996, but I used 3/4" x 3/4" cause was what I had available at that time.
You can also use http://www.thingiverse.com/thing:2074478

by ranita
Anet A8 Ultimate Frame Stabilizer - HEX REMIX
by AVall20