ABRU 4 part folding ladder clamp

I have one of those ABRU folding ladders, every other time that I move it, one of the legs moves and gets locked. Well, I have the tools to fix, 3D printer, PETG filament, Alibre CAD software, (also, designed on FREECAD as an experiment), hey presto, the solution,

I printed with PETG which I have found to be perfect when a little bending is needed, PLA would probably be too brittle.