I got the planter home sat and was looking in the book for fert setting. So it lists 2 sprockets the driver and the drivin. But the guy wrote some different numbers in the book to get 233 lb of fert they are 20-34-36 driver 16-24-30 driven. Book says there is a sprocket available with the 20-34-36 but not the other. Thanks for any help on this