Peugeot 206 T reg rear wiper droped like a tail, had acident with barrier left tailgate up at tip very lucky did not shatter glass, however wiper now like a tail, can see plastic cracked the nut moves as it should my question is has a part come off that holds it in place near the nut like a washer or small fixing
If you take the nut off, the wiper arm (which sounds like it has cracked) should pull free....generally as the nut is tightened down, the arm self cuts onto the spline on the wiper motor shaft. Again, a new one needed!
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