I purchased a couple of Scotch-Brite wheels and a mandrel for the drill press so I could buff out the edges of the wing ribs. In hindsight, the router did a really fantastic job of cutting out the ribs, that I doubt that this process was really necessary. But the one thing that I want to avoid is splitting the metal during the pressing process of flanging the lightening holes. So I went ahead and did it to be safe.
The subject of Scotch-Bright comes up often, not only in the Bearhawk mailing lists and newsgroups, but in others as well. At the recommendation of one of the Bearhawk group members, I chose the Scotch-Brite EXL 8A Medium wheels purchased from Wicks Aircraft Supply. I bought both 1" and 2" wheels and required mandrels:
I also purchased Wicks #F3753 Scotch Brite 7A Medium (6" dia x 1" thick) that is meant for a bench grinder, but turns out I didn't need it. I'll keep it around, though, as I'm sure it'll have use later.
Those ribs put a nice ridge in the Scotch-Brite wheele
93 nose ribs, deburred and ready for action
A close up view of the nice job that the Scotch-Brite wheel does on the lightening holes.