After threading rail through middle post, place “Spring Thing” into pre-drilled holes at ends of rail. Position bottom pin of “Spring Thing” through bottom hole in rail (1). Compress “Spring Thing” while bending it slightly to line upper pin with top hole in rail (2). Rail end should look like figure (3) when done. Slide rail to post. Depress upper and lower pins so they are flush with surface of rail. Slide rail into post. Pins will pop up into place(4). If you do not hear a positive “pop,” simply bang the side of the rail near the post hole with your palm.