A. Bruce Zaretsky, a landscape designer and contractor who lives near Rochester, N.Y., responds: I agree that you should think twice about using wedge-type or masonry anchors in this kind of stone. When you drill and anchor so close to an edge (as you will when installing a railing), there is a good possibility that you'll crack the stone or break off a section.

Instead of anchors, we've had good results using hydraulic cement, which is a fast-setting cement product used most often for filling holes in watertight vessels.

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