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dAdjust the inner sliding rail until you can see the screw holes.
eAttach the mounting bracket to the front end of the mounting rail and align the screw holes. Secure it with two M4 x L8 screws with nut and washer.
fSlide and adjust the inner sliding rail again to see the third screw hole. Secure it with one M4 x L8 screw with nut and washer. The position of the mounting bracket on this end is fixed.
