the owner's manual is very vague about the setting of the beater grate. i have found a decal on either side that says something on the order of "remove beater curtain b4 lowering beater grate" or someting of the sort. on the left side there is an 18 mm nut near the decal and on the right side there is a lot smaller sized nut with a couple of washers on it. what is the proper way to lower and raise the grate???