so which hexagon socket screw fits version a model ST1520S hinged shaft? so confused. is it upper screw for 5.29? and is a part necessary to secure it? also hex wrench is that available in parts?

Right part I needed.

Second time trying to replace a screw/bolt that holds the folding part of the E-Go stringtrimmer, which got lost when it dropped into the grass. Very hard to tell the parts apart in the diagram, so it was a matter of guessing. First one too long; second one just right.