I have the 743 and have a sand bucket on it. I have been filling my card with some black clay and want to top off with river sand. I have been trying to play with grading anf I suck at it. I'm told my machine may have a grade feature but I have no idea how to use it, engage it or even see if it is there. Can anyone tell me how to tell if my 743 has the grade feature? Can you also provide any tips or pointers on grading a yard flat but sloped to allow proper drainage. Is there a grading attachment for dummies (like myself)?