Fabricated rudder bottom attachment strips per drawings. Clamped and drilled to skin and rib. Used a 0.032 Alclad sheet purchased from Lowes. Disassembled rudder; deburred all holes. Dimpled skin, spar and ribs. Had to use several dimpling methods: Hand squeezer, Vise-grip type, and pop-rivet type. Primed new strips and touched up some other parts. After priming, peeled plastic off of top counterbalance strip and re-primed. (Oops.) Cut protective plastic from skin around holes to be riveted next.