<,The screw that secures the wiper arm to the shaft will often loosen and allow what happened to you. Fold the arm out and see if the screw is tight.>>
Gee, on my 201s (2) with headlight wipers, the shaft was threaded and had a nut on the end which was known to loosen itself from time to time. To access it, the short end cap is swung out, not the wiper arm. RLE
