It's been many years since I replaced my turn signal switch so I can't recall. I looked at the Parts Illustration Book and found this: http://www.thefirstgensite.com/library/partscounter/illustrated/misc/steer1.html

If I am interpreting this right, the tilt wheel has a spring under cancelling cam and the standard over a different cancelling cam.

And... I wonder what percentage of drivers in 2017 know what "hanging my arm out the window" means? Is it even in the states' DMV rule books now? And finally, I wonder if the driverless car software recognizes a hand signal?