Originally posted by Lester444
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Carbon rods such as found in automatic pencil lead or in the interior of ordinary wooden pencils might be for now do the job. If you need pencil lead that is thicker than found in that sold for mechanical pencils, you may decide to extract the lead from a wooden pencil. This can be done by boiling the pencil in water for awhile to cause the two pieces of wooden sheathing to come apart. Sometimes carpenters use extra thick leaded pencils
I hope this is useful.
Nice Demo. Keep up with the good work.
Warmest regards
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