Step 9: Filing and filing.
This step removes some of the the weak points in the picks, helping to ensure that they don't snap off inside locks.
In the first picture, I am pointing to the area you need to remove with the tip of my file. As the pictures progress, you can see the material going away. I didn't want to take too many intermediate pictures because I didn't want to get metal powder in my camera. Continue to follow along with the pictures as I have them laid out. You are getting so close now.