I have decided not to do this myself. zero time for it. However, if you are in the UK, or don't mind shipping your carbs there, I recommend these two businesses. I have dealt with both of them for a long time. They do full reconditioning as well as all the surface treatment. Harpers Ultrasonic, Matt also offers a ceramic painting service, these ones in black. and they did mine in silver. Vapourworx Ben vapour blasts the carbs as well as all the extras.