Searching for Electode Material

	Hello, I'm looking for some better conductor for my air-blast gap than
what I'm currently using.  I have 1/4" steel bolts for electrodes right
now, and I realize that steel is not good, but I can't find any copper or
brass or aluminum bolts.  (Isn't brass just copper with a sodium hydroxide
shell?)  Also, does anyone have any info on the conductivity/heat
dissipation of zinc?

	       Ryan Ries