Brief Description: F-704 Bulkhead - Fab F-633 Control Col Mounts 2
You can see below the 1/2 inch diameter hole gave the 1/4 radius transition between the straight edges of the cut out. I then cut out the material on the band saw. I smoothed the rough cut with a sanding drum. Then I drilled the 3/16 or #12 hole on the top of the mount.