Use a pure copper soldering iron bit, if your bit is iron
plated then obtain a piece of copper rod of the same length.
Cold Curved Awl
Tip of Soldering Iron Converted for Embedding
Before cutting the groove in the tip the tip should be
shaped hemisperical or to a blunt bullet shape either by turning or
Cut the groove with a 'Junior' hacksaw and remove burrs with
fine emery cloth or 'wet and dry' abrasive paper.
Polish the groove using a piece of string and a metal
polish (Solvol Autosol is ideal) also polish the curved end and about
12 mm along the sides (which helps in cleaning)... Repolish after the
device has had a couple of hundred hours use.
Written... Summer 2000
Revised... 02 March 2002