Continued to scuff the seat ribs to prepare for dimpling. The two center ribs require a cut out for a snap bushing to match holes in the F-705. Checked edge distance from closest holes and it is satisfactory. Used a Dremel sanding drum which was just the right diameter to make the cut out. Finished with files, emory cloth and scotchbrite. Re-checked edge distance and it was good. Repeat process for second rib. Used the countersink to prep the connecting plates on the removable section.
