Well, I cracked it. It slipped out of my hands and hit the sidewalk. I would like to "paste" the three pieces back together. One problem is the mass of the thing. My weight lifter son says he is sure the largest piece weighs over 200 lbs. The whole thing is less then 25 inches in diameter.
My first thought was RTV it together but I am sure that when I put it back on the pedestal (which is less then 1/2 the diameter of the piece) the RTV won't have enough strength to hold it together.
I thought if I could get a 1/2" thick slab of aluminum, say 24"x24" I could cut off corners and use it as a base. But the big box stores don't have anything near 1/2" thick.
I don't think exterior plywood would be strong enough and could stand up to the weather "forever".
bowl & base were designed to fit together - not on a supporting plate,,, we drill & pin but use epoxy rather'n pl,,, set pieces on vertical, drill holes for pins, blow out holes to be sure there's no residual dust & epoxy threaded pin into place
when those 3 pieces're ready, put it back together the same way starting w/2 larger pieces,,, its not difficult work
used to make those & can't remember using mortar of any kind,,, granite has such a tight grain that adhesion would be an issue in my thinking,,, monuments, by definition, have no time limit
that being said, try granquartz - they are major suppliers to the craft as are granite city tool (barre, vt) & john miles in elberton, ga
Apply what ever glue put it together with a strap clamp, drill the holes for the pins from the outside and patch the holes. Build up under the bottom with a mortar reinforced with stucco mesh
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