There are two sets of contacts, one is under the button, the other is the slip ring on the back of the steering wheel.
The slip ring contact wears out and you have to pull the wheel to get it off,
if the slip ring is bad sometimes you have to replace the hub or the whole wheel....
Use a sharpy to mark the wheel and hub so you can get them back in the same
place otherwise the wheel and turn signal cancelling are out of sync....
This is really easy so dont sweat it, do it once and your an expert.
Good luck.
Dave