Fletcher mount cutter, shaving the guide plate

[bang]

Cutting mounts the other day and I noticed some crumbs of black dust like stuff on the back of my mount.

Turns out, my mount cutter blade is hitting the black plate that holds the mount in position, the plate under the guide rail.

The cutting head doesn't have any wiggle to it and moves freely. I tried adjusting the Allen screw ports on the cutting head, but that doesn't seem to solve the problem.

Does anyone know what to adjust to stop this?

[bang]

A follow up...

I managed to fix the problem, for now.

I think one of the screws on the cutting head had become too tight.