Laid out rivet pattern on trailing edge skin between rib-1 & root (# 40 bit) drilled & clecoed. These few holes will get riveted later after wing is fitted to fuse. Deburred all holes, filed all edges and rounded corners of root assembly. Filed rear edge of trailing edge skin flush with upper rear skin. Cleaned root assembly with laquer thinner and primed mating surfaces with Zinc Oxide (spray cans).
