Any decent hobby shop should have spring wire in a variety of diameters,
including the wire needed for the Duo-Art tracker ear.  It is impossible
to measure the diameter without taking the tracking ear off the bar, so
it is just a guess that the wire is about 0.020" diameter.

Spencer Chase
Garberville, Calif.
http://www.spencerserolls.com/ 
spencer@spencerserolls.com.geentroep [delete ".geentroep" to reply]