Turn Signal Cancel Cam

Has anyone ever used one of these aftermarket turn signal canceling cams? Are they junk?

Chrysler 62-66 New Turn Signal Repair Cam TS13 Made in USA Repl 2258700 2822170 | eBay

My cam is broken on my 66 Dart and I'd rather not have to replace the whole switch, as the wiring and rest of the switch is in great shape.
My guess is that it will work when the problem is mechanical.
I'm pretty sure I saved the one I took out of my car years ago. If so, I'll post some photos 'cause I *think* that is the part that failed.