My order from Spruce arrived today. Tried a small Scotch-Brite wheel for the drill. Used it on the flaperon arms and tie down ring as those thick parts had some machining marks that needed smoothing. Not completely gone, but much smoother now. Also used the deburing handle on the lightening holes, but those were pretty good already. Finished up the starboard spar and rib deburring and applied Cortec. Next time I should be back to riveting.