As a side issue, which may not apply here, is that sometimes old headstones become unstable. A stone mason can fix this by removing the headstone to a workshop, drilling slightly tapered holes into the stone from underneath, that is, into the hidden flat part that lies in the plane of the ground when installed, and then inserting long tapered bronze rods into the stone so that the other ends of the bronze rods go into the ground at the cemetery, thus holding the stone firmly in place, with modern technology, yet still looking like it did before.