Originally Posted by deggers

Spark plug consisting of BeCu one-piece center electrode with 3/16 ball on one end and screwadapter on other end, one piece, no welding allowed. Ground consists of BeCu Tri-Arc cage, arcs 120 degrees apart eminating in solid ring. Shell counter-bored, ring inserted in counterbore and welded in place, with equidistant gap of .030 universal throughout 180 deqrees arc of ball.