PS the new wiper arm (which has the 'hook' configuration) was purchased from my dealer who installed it with no labor charge (something I doubt the rest of you will achieve). I believe there is a DIY posted somewhere.

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Mark _______________________________
2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2 , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT
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Life is not fair!
You can't protect people from their own stupidity!
Laughter makes life worth living