@MELGAR posted:Try putting the two pieces together without the metal rail joiners. Then take them apart, insert two rail joiners into one piece and a third into the second piece - then connect the two. The first assembly may flex the plastic parts and make them easier to assemble on the second try.
MELGAR
Works but what a pain. I need a better pair of gloves while doing it. It’s mainly the 40” curved that are the problem. The others seem fine. Also I am just keeping them straight but it was all I could find a few months back.