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iRobot Roomba 400 Gears Discovery 4210 4xx 4xxx 405 4110 4210 4230 415 440 dirt dog 435 from the gearbox, there are 2 of these normally used. I made a fake involute gear shape just approximately. (I don't know how to do the proper math) but it is so small that shouldn't matter. I made this to fix my roomba and now you can do the same :-)