The main blade grips can go on either side. The screw head goes into the "nut" hole and the nut actually goes in the round hole. (it is opposite of how it looks like it should go) The blade grip arm and ball will be on the "thin" side of the blade or following the blade. If the blade is at the 6 oclock position the arm should be pointing towards 5 oclock. They grips are upside down (so to speak) for some reason.