does anyone know how to read the adjustable depth chart on the case 800 planter i just got this planter and will be using it for food plots it was set up for corn which is fine but i also will be planting wgf sorghum and need to shallow up the planting depth the guy i bought it from had it set on about 2 (it can be set from 0-10) how does that relate to dpeth in inches the sorghum i will be planting needs to be no deeper than 1" any help would be appreciated if anyone had an old manaul and has the ability to fax or scan and email that page if they have it would be awesome