I need to bevel one side of a Glock 23 trigger guard to keep my middle finger knuckle from being abused with each shot. I know this is a common issue and many have suggested ye 'ol Dremel, but it seems a bit aggressive and could end up worse than planned. What do the Smithy gurus suggest? Small rat tail file, fine grit paper? I'm not looking to remove a lot of material- just bevel the outside edge a bit to take the bite out.