My first 'oh $&^%!' moment this morning as driving on the freeway in the hammering rain and the windscreen wipers stopped working. First the driver's side completely, then the passenger side got sort out of sync and was too low to be of any use. The motor is still working, the bolt/nut in the windscreen wiper is still going back and forth (and was tight), so I assume that the fix is simply to replace the windscreen wipers because it's no longer gripping the spindle? The passenger side wiper presumably partially slipped once the first one stuffed up, so I'll replace that too. ...but let me know if there's anything else I should be checking before ordering the new wipers.