The grinder was a little loose so installed an extra screw with two of these washers. See video below. Just scale in the Z-axis for a tighter fit if you'd like it, but I wouldn't risk it. These machines are designed without a screw at that location so they should work perfectly without. Use this at your own risk.

I only share this model here for people with no design abilities. If you know any basic 3D CAD, you can design this in 10 seconds.