Systems and techniques relating to IQ mismatch estimation and compensation are described. More particularly, when the casino gaming system generates a jackpot, and awards the jackpot to a player at a gaming machine, the amount of the winning jackpot is recorded on the external attendant paid bonus win meter. The system addresses fault masking that can occur during testing. The grooves in one aspect define a continuous pattern about the circumference of the tubular body which intersect to form a plurality of substantially identical shapes, such as diamonds.