Having just started on my toolbox kit I wondered what the best tool is to deburr those hard to reach areas, so far in my toolbox i have 3 different scotchbrite wheels, hand pads, vixen file but nothing to tackle the smaller jobs such as this, is this the time for a Dremmel purchase!
Get a roll of cloth backed sand paper and tear it into strips about 1/4" wide and 6" long. I have a small round and flat file I use to break the edges before I sand. Have fun. When deburring the wing ribs you will think there is no end.
These "cartridge rolls" mounted in a dremel or air powered rotary pencil work really nicely. They are commonly used for mold polishing and 2-stroke porting work.
Scroll down the page to where it shows the spiral wound tapered rolls and shank adapter. That is what I am trying to share.
Fine grit is best for our application.