It is so Ironic that I found this today. The guy who taught me to make knives and I were talking about making a jig to get our flats higher, but we couldn't for the life of us put together a good concept. We have been using a 2x4 with a lag bolt and bar clamp and we stacked washers to increase the angle but it would not give us a very high flat. This is perfect. My only questions are what size angle iron and what kind of hardware did you use on the file guide.