When processing a file soft metal (or plastic wood) in the notches of stuck particles of cutting material, which is not easy then to get rid of. This will not happen if you RUB the tool with chalk or charcoal.
When processing a file soft metal (or plastic wood) in the notches of stuck particles of cutting material, which is not easy then to get rid of. This will not happen if you RUB the tool with chalk or charcoal.