Fabricated more forming blocks for bending tabs. Fabricated two practice pieces and bent them to shape. Bent end tabs on both sides of E-619PP-1-020 trim tab skin. Trimmed, clecoed and drilled E-717/8 trim tab horns to skin. Measured and match-drilled trim tab half of E-721 trim tab hinge in place with E-607PP trim tab spar and skin. Disassembled, deburred and edge finished all parts.