Ok so I have a set of fixed blade stingers that are easy to sharpen due to the bevel being a single size all the way to the tip. I have a set of Magnus 2 blade old school style newer blades that I am having a hard time sharpening. They have a standard bevel about 60% of the way up but the top 40% of the blade to the tip is a wider bevel. Anyone have any advice on how to get that razor sharp? They shoot true and are awesome heads but not sure what to use to get those top 40% back razor sharp? Open to advice