[herringchoker]

Why not go to a good auto parts shop (like Ductape says) and get a new arm and blade? When I built my cab, I bought a new Curtis wiper motor for the rear window (most expensive single item on the whole cab!). It did not come with an arm or blade, so I got them from a good auto parts store (local AC/Delco distributor). BTW, that hexagon end with the hole in it looks something like part of what I did get. My wiper arm has a joint near the end where you can adjust the angle of bend in the arm by loosening a screw (that threads into the hole) and rotating the end of the arm around the screw. My old pickup truck's wipers have the same setup. (If I had a pic I would post it - sorry.) I think the end piece of your wiper arm may be missing.