I need to mate the gusset plate to the repad. The repad will eventually be added to the side of a tank, so I have created the parts with the appropriate radii. On the gusset plate I made an extrude cut with the radius, thinking that it would mate up with the repad's outside radius. However I can not get the Coincident or Concentric mate to work. Is there an easier way or something I am missing? The assembly file shows that I need the gusset plate to be perpendicular to the repad as well.