A replacement retainer ring for the Thumler's Tumbler, A-R6, No. 120, a 9 pound barrel capacity tumbler, is available for $3.57. Be sure to keep the retainer ring oil-free during the tumbling process and when handling the retainer ring. (Wash hands.) Oil will cause the retainer ring to deteriorate. The A-R6, no. 120 retainer ring holds the lid tight to the barrel to contain the tumbler contents. (Part number 906R-6)