The Robert Sorby large tear drop cutter is a great replaceable cutter for the rapid removal of material. It fits to the swan neck hollowing tool and swivel tip probe and can be swivelled to get the desired profile for cutting.
Sharpening is done with a diamond file of honing stone. Regular honing should be done to maintain the edge, and extending the useable life of the cutter. The cutter is honed across the top face of the cutter. The profile of the cutter can be altered, holding the cutter in the RSB-W472 cutter holder, to safely achieve the desired profile, after which the continued honing is done by honing the top face as normal.