This gear was not your typical maintenance item. Jack's did not have it in stock and had to special order it from the manufacturer, which took a couple of extra weeks for me to get it. I called to ask whether it was still available. The customer rep was very helpful. When I received it, it fit perfectly.
I had told myself that if these parts were too expensive, I'd trash the mower and buy a new one. The price was very reasonable. I've never had problems dealing with Jack's Small Engines and plan to use them whenever I need parts.