Facing the tie block, Torres used a thin facing of ivory, possibly piano key ivory. Plane the tie block level and check its height. Make a caul and face it with cork cut your ivory or bone facing slightly oversize and glue it on. Trim it up when the glue is dry finish sand and put French polish or other type of finish on the bridge. Mask the bottom of the bridge, always take care not to get oil or grease on the bottom of the bridge.