Over 40 yers ago I started with a Thumblers Tumbler and corn cob media and two tablespoons of brasso. Graduated to a Lyman vibrator with the same media and Brasso. Now I have the two old ones and a Dillon 1000 I gat at a gun show 12-14 years age. Use the same media and three tablespoons of Brasso. Never had any problems at all and clean brass every time and use the stuff for several years before changing.