Good thinking to check and make sure. A lot of times, the nub is marked where it makes contact, but yours might be too new for that yet.The picture above is before the modification. I wanted to make sure that it was the nub that made contact before the choil. Otherwise, I would be grinding in the wrong location. I did not take it apart after the modification to tale a picture.
Refreshing to see others who are willing to take care of simple fixes themselves.