How do you guys create your fluting on guard material? I use a dremel with a cut off wheel to create the line, then use a chainsaw file to enlarge and round out.
first scratch a line with the tip of a drill bit, then file the line with a triangular needle file, then go over it with a round file.
Next wrap increasinly finer sandpaper around the shaft of a 0,5mm smaller diameter drill bit to polish the inside.
Take it to 2500 gritt and make it shiny inside
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