With the arms off you will see the mechanism moving back and to if you switch the wipers on and all is OK. If not, then the motor/linkage is faulty. If Ok replace the arms and just "nip up" the retaining nut. The arms seat on serrated spindles and if the soft metal of the arms becomes damaged they do not grip and consequently are useless. In this cold weather the blades get stuck to the windscreen and can cause this if loose.
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