Started working on installing the aileron trim. Didn't get too far today fo as much time as I spent on it. Managed to drill the holes in the delrin block and chamfer the edge to fit the brackett. Removed platenuts on the center two fuselage ribs. Drilled holes in F939 right floor for brackett screws to go through. Attached brackett to center ribs and drilled second set of holes and dimpled. Installed the four platenuts on the brackett.