Brought out the die grinder and put a Scotch-Brite wheel on it to smooth the inside of all the lightening holes on the webs of all the vertical stabilizer ribs. Worked great. Prior to this step, I ran the rib flanges over a Scotch-Brite wheel mounted on a bench polisher. Still need to use a fine file to smooth the metal between the rib flanges. There are piles of ribs in the wings … so finding a system that works well now will be beneficial when the wing kit arrives.
The die grinder with a Scotch-Brite wheel makes short work
of deburring holes in the ribs.
Those experienced will question my leaving the blue protective film on the ribs … not to worry, the film will come off for primer prep and a maroon Scotch-Brite pad will be used as a final smoothing step on all edges as well as scuffing the metal for primer adhesion.