Ride-On Toy Gearbox Output Gear (12-Tooth Hub)

This gear exists because my kids had way too much fun and immediately broke the original part — more than once. Each failure meant either dealing with returns or buying an entire replacement assembly for a single small gear (often $25+), even though everything else still worked perfectly. I designed this replacement so the actual failure point could be swapped quickly and cheaply, keeping the toy running and the kids playing. Sharing it here in case it saves another parent the same hassle (and cost).