now 81 and still at it. yup jeff is polishing my way now and happy. and have many more using my method. i now am making a limited number of 6″ 98+ pure tin laps. the softer tin holds the diamond better and charges into it, very similar to the early tin laps made by crystalite. but not soft enough to change surface. the machining of surface to be as flat as possible is the only scoring needed. best to use a sweeping action on any lap for polishing as any surface texture can be worked into stone surface if held in only one spot— move it.