Forgive me for for raining on the parade of accolades, but after all these years since purchase, I have to say the self centering unit is a beautiful piece of machining but falls short in use; it's really little more than a pretty face. But as zapdafish asks "Doesn't this do the same thing as the trim stop attachment that comes with the Domino?". The advantages are negated by the minimal ⅝" protrusion of the two tabs around the workpiece while the one that comes with the tool, while being less elegant in appearance, does ride along about 3 inches of stock making for far greater accuracy and ease of control. Sadly I give this a One Star rating, regretting I purchased it.