I expand them in the nosebridge just like a conventional rivet,then polish the existing material down flush, next step is to beadblast so the finish is uniform then paint.im going to be doing this on a pair of pennys that were drilled wrong from the factory,its really the only thing you can do without filling and redrilling the holes.Mark, what is a flush rivet look like? Do you see them or do you sink them down?