Cannot get this thing near to perfect, slate seems to need to be ground. It is an old GC from the 60's or 70's with floating slates that are pinned. The question is where to start the slates. Someone told me you should start from the end rather than the middle like normal. Before I start grinding (stopping at a local granite place that does cabinets on the way in today) is it correct to start from the end?? Also, I assume I level from the high leg to the center legs and then to legs at the other end.