If I understand you correctly after you use the larger graver to cut the 'main channel' the smaller is used to cut a round undercut on each side and deepening the undercut with Roland's inlay graver? I assume the larger round graver used to insure the line is even, as a round it should cut an even line as it cuts past center without tearing out the sides, brilliant. I'm just about ready to start attempting inlaying, perfect timing, thanks.
Bob