No mercy single bevel to double?

[KyRidgeRunner]

For those of you that have turned these into double bevel, how'd you do it?  Is it as simple as elbow grease and a file or do I need a bench grinder or some sort of sander?

[Biathlonman]

Nope, I've done it with a file.  Worked fine

[ChuckC]

either way will work.  Its not that difficult.
ChuckC

[KyRidgeRunner]

Thanks fellas.  Just took a 10" file and converted a couple.  Not to bad and they've already drawn blood..... Just not from a deer....