Okay here is a dumb question for -7 &-8 wing builders. I'm putting the finishing touches on my wing skeleton before final assembly. With all the ribs riveted in place, how in the world can you deburr between the ribs & the spar flanges? I'm refering to the joints where the skins attach the spar & ribs. There are 5 holes per rib that you obviously can't get to to deburr the spar flanges not the back side of the rib attach tabs. 4 holes on the front of the rib & 1 on the rear spar flange. my only reason fo asking is that I'm finding some pretty nasty burrs on the back side of the main spar flange where we counter sink for skin dimples. Do I try to get some sand paper in there or just let the burrs live where they are (if there are any)? I used a reamer but after counter sinking, Im finding a decent amount of deburring is needed on the back side of the spar flanges. I dont want a wing folding on me because of some little burrs (that's sarcasm).