@lf-tp2511 posted:The photo below is the close-up that was posted of the Momo splined hub -
it definitely incorporates not just one notch like the OEM hub, but two notches. Perhaps the second is for a different application?
I don’t understand why you say the Momo lacks the notch? 🤷♂️
And just for clarity, here is a photo of the cancel cam, showing all of it, something that hasn’t yet been posted to this thread.
Larry
I never said that the Momo adapter did not have the notches in it. I said that they don't do anything (at least in my case) because they do not mate properly with the cancelling cam.
They don't mate AT ALL with that cam.
Here is the picture of my cam. According to the assembly diagram, the tab mounts up.
There is no tang on it to lock into the adapters notches. Is there more then one cancelling cam design? NO ONE, including Wilkinson seem to be able to answer that simple question.
Your picture shows a tang on the BOTTOM of the cam. My picture of the cam in the column shows that the illustration is correct, i.e., what is up and down on that cam. That is reinforced to me on how the directional switch needs that side tang to cancel, BUT WHERE IS THE INTERLOCK TO THE STEERING HUB?
Also in looking at the entire assembly, what is the additional tang on the bottom of the cancelling tab for? In my column, that would mate to nothing and mine doesn't have it? 
What I did, and likely will continue to use, is a 1/32" roll pin I installed into the bottom of the Momo adapter that drives the cam canceller.
The other alien device that you are looking at is the commutator for the column mounted push button start switch.
