As MJ says its a press fit joint and perhaps may go back together after a clean. However, it does look pretty worn and may well be beyond repair. The only problem with a second hand unit is that the linkages may well be worn too and it will be a "slapper" at best. I exchanged a unit with The Laird and so at least one of his (the one with the good motor) will be worn - I am sure he wont mind me saying this  . The one I got from him has been OK but is now over-running on full speed. I have thought about ways to adjust the the linkages as the motor is OK and I am sure that the unit comes with motor/arms etc.
Sounds like MJ has a business opportunity upgrading wiper arm units! 
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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