Yours is the correct way. www.cutsforthknives.com in Oregon ( good reputation) markets the excellent Martindale or Crocodile ( logo and popular nickname) line of machetes from G.B. These come with a file as desireable as the machete itself! Machetes are usually much softer than other knives. This makes sense considering the chance encounter with unseen hard knots or rocks. The blades tend to bend rather than chip or break. There are a bewildering variety of blade shapes for many purposes. I find something @ 14" a good all around choice. Sheaths are rather superfluous. If you really need a machete, who's forte is clearing light grass and vines: It belongs in your hand. Some of the unusual designs also give you the psychological edge appreciated only by a Malay Pirate ;O)