An electrode includes an elongated body defining a longitudinal axis. A seating end portion includes a first truncated cone. The first truncated cone has a first truncated end and an opposing conical end. A working end portion includes a second truncated cone having a second truncated end. A constant length is defined between the opposing conical end and the second truncated end. The constant length is about 0.875 inch +/−0.001 inch. The elongated body is located between the seating end portion and the working end portion.