Hi, could I get some recommendations for a small portable sharpener that has a 40 DEG (20 DEG + 20 DEG) bevel angle? It seems all of the cheapo pull through sharpeners have a much wider 60 DEG bevel angle, way too dull for me. I want to go with the pull through option because the blades are 8"-10" in length. I'm just not skilled enough, and lack the proper technique to use a small pocket stone on very large blades out in the field. Thanks.