Use when a task needs the judgment of a Quarry Rock Splitter — reading grain/rift/hard-way direction to lay out a split line, choosing plug-and-feather vs jackhammer channel vs mechanized (wire saw, chop saw, hydraulic splitter) splitting method, spacing a plug-and-feather hole line for a given rock type, sounding a face for seams before committing a cut, or deciding whether a block spec should be revised to avoid a hard-way hand split.
