Made the two R-918 rudder bottom attachment strips per the plans. Deburred edges and clamped in place. Match drilled to the skeleton using the skin holes as a guide. Began disassembly of the rudder for deburring. Deburred all holes in left skin and finished all edges. Deburred the holes in the left rudder extension. Beveled the counterbalance skin as shown in DWG 7 and deburred all holes, finished all edges.