Please help me figure out how to get the remaining plastic out of the bed rail? The corner snapped and I ordered a new corner part but need the remaining plastic gone
Use a heat gun or hair dryer to heat up the end of the bar and the plastic piece inside it, then use a screwdriver to pry the plastic part on at least one side so that one side of the "square" is majorly indented. Then you should be easily able to pull it out with pliers, or maybe even just the screwdriver you already have out.
Remove the corner piece from the other end of the bed rail and send something through to push or knock the broken piece out.
A broom stick, a pill bottle filled with coins, a C or D battery, etc. Just find something that fits in the bed rail but won't fit through the broken piece. Hold the bed rail vertical and shake it up and down until your messenger taps the broken piece out.