Just to give you a different perspective, I file my swedges/false edges before heat treatment. I use a 'vise within a vise' setup to hold the blade, and file horizontally, adjusting the angle of the piece being filed, not the angle of the filing. Mark/scribe the centerline of the blade as a guide. I set the angle for the blade, set a file guide where the swedge is to terminate, then file in the plunges with a round chainsaw-type file. I bump the file guide up to halfway into the plunge to keep from messing that up, then flat file in the rest of the swedge. I figure I'm less likely to mess things up with the file than I am with the grinder, I suppose...