As such, these two pieces can be placed inside the dovetail mortise.
When the third spacing bar is wedged between the two, however, they're pushed out to fill the space. There are holes in the
exposed portion of the three iron pieces such that a shackle or bolt may be inserted, thereby allowing the stone to be easily
lifted and manipulated into place.
Although there are several theories as to where the term lewis came from to refer to this device, one of the more plausible, given
the close relationship between the operative masons and the clergy, is that the term derives from the Latin word levis, which means
to levitate or lift up.
Regardless of the origin of the term, or its applicability in modern Freemsonry, there can be little doubt that no prouder moment
exists for a Mason than when he can raise up his son and welcome him as a brother in our Fraternity.
-- The Masonic Bulletin, Northwest Ohio Freemasonry, May 2017