As some of you may already know, my dad, Morris Szyferblatt (Szyferblatt Optical Machinery) passed away last year, after many years of manufacturing and servicing in the optical field. I have over a dozen used diamond wheels, and wondering if anyone knows of a market for these. I've been told that there are companies who buy grinding wheels back for the diamond value, but have not been able to track down a contact. If anyone has any suggestions or information, it would be much appreciated. Thanks.