The control column mounts require drilling and trimming. I taped off the bearings to keep shavings out.
I marked the holes with a punch, drilled with a guide bit, drilled to #13, then reamed to 3/16″.
I then marked the cut lines and rough cut them on the band saw.
I cleaned up the cuts with a file, the scotchbrite wheel, and some emery paper. I also rounded the outside corners.
One more step completed.