My problem when filing wedding bands is to keep them square to the centerline of the butt plate( not going crooked), and keeping them even. One miss or a file skip out of where you want it can lead you to modify the bands alittle.How about usind a piece of masking tape cut to the width you need. Then you could position it where you want, then file the one side of the rings, remove the tape then file the wedding band.For files I use a sharp edged file with an acute angle (knife edge), I don't know the name of it. I also use the triangle needle file. I don't know if this helped you or not. ...Geo.