Deburred the landing gear weldments. This was a bear. The burr "side" of the holes for the landing gear legs are on the upper end of the holes and are nestled down in the weldments. This made it very difficult to get any kind of deburring tool on the hole. I ended up using sandpaper and made very slow, short passes. Bloodied up my knuckles in the process. I deburred and edge smoothed the fiberglass seat back top as well.