I use a small triangular file to create a little v with a couple swipes on the fret slot. Somebody in another thread said this was a Dan Erlewine tip. Fretwire is extruded so it has a fillet ( fill -it) at the tang and bead intersection. This helps start the fret and also supposedly helps with chipping if you need to remove the fret. No pic of the file, but it is about 3 -4 inches long and not too wide. This is a couple with the v and a couple without the chamfer. The slot isn't really as wide as it looks.