Our firm does a lot of kitchen remodeling, and recently we had to extend an existing marble countertop a few feet. Locating a similar piece of marble was hard enough, but the real test came during installation; any unevenness in the glossy surface would be quite noticeable.
We got a precise fit by using a flathead screw under each corner of the new piece. The screws were easily adjusted to the right elevation, and they kept the heavy marble from sinking into the slowly curing mastic.
Max Durney, Petaluma, CA