To complete the work and install the W-423 Joiner Plate and the W-408 End Rib. I first dimpled the K1100-08 Platenuts, while not required this allows the platenut to sit flush agianst the rivet dimples in the W-423 joint plate. After dimpling, I riveted the platenuts in place then, clecoed the parts together and test fit the joiner plate to the outboard leading edge.