Hi. I’m building the Mattone Barile Grande. On page 15 the plans show a notch being cut in what I believe are the four top bricks of the chimney (3/4" x 4" x 2.5"). The plans say “you will need to trim the top layer of firebrick to the dimensions shown below so the 6” Dura Tech Anchor Plate can fit snugly into place." For the life of me, I can not figure out why these top bricks need this. ???
Another chimney question - the plans show all sort of fancy cuts to the chimney layer closest to the dome. Is that required? And how does one do that? I have a 10" mason saw. I was thinking of leveling the first row with mortar instead of cutting.