430 Intermittent Windshield Wiper Operation

I've looked at both the owner's manual and the shop manual for my F430 Spider as to how the intermittent windshield wiper is supposed to operate, but I am baffled. While i don't intentionally go out in the rain, weather here in Colorado is unpredictable and sometimes I get caught. The photo in the manual is below:
Wiper.jpg
It shows some part of the wiper stalk is supposed to rotate to control the intermittent speed, but I can't find anything that rotates. The rubber section of the stalk turns the mode selector (off/intermittent/ low/high) and nothing else on the stalk moves. I'm obviously missing something or something is broken. Any clues would be appreciated.
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Oh wait - this was dumb. The stalk up/down controls the off/intermittent/ low/high and the rubber rotate controls the intermittent operation. I just have to fix the rubber as noted in another thread. Sorry for the error.