[mickmate]

If you lay out the line with a tape edge and work back to that. I used a right angle die grinder with a 2" sanding disc for most of the straight line and the drum sander for corners. Use sharp sanders and don't get too much heat on one spot for too long it will burn the paint. Work in towards the inside with your sanding and filing so it doesn't pull any paint off the edge. Paint the inside edge when you're done as it's already masked. Don't post it on the internet and no one will ever know it's been done ;-)