We employed this method in the back of a PU truck to sharpen spears as a kid in Nor Cal.Somewhere out there, there's another vid of somebody 'sharpening' a knife or tool of some sort on the asphalt, while hanging out the back door of a van being down the street. These two vids display a similar 'redneck sharpening' kinship, in that regard.
Ah, here it is (sharpening wood chisels):
[video=youtube;wdoAVHUFNwM]https://www.youtube.com/watch?v=wdoAVHUFNwM[/video]
David
We employed this method in the back of a PU truck to sharpen spears as a kid in Nor Cal.