Looking for suggestions. I'm thinking about building a rotary tumbler like the Thumbler's model B that would hold 10-15 pounds of material. The Thumbler's sell for about $200 shipped which isn't horrible, but it isn't free either. The frame and drive are no problem and I have appropriate motors. I'm struggling with the drum design which is typically faceted and includes a molded rubber liner that seals water tight when the lid is clamped on. I can bend up and weld a drum, but what to do about the liner which looks something like the one in this pic and sells for $55?
I'll mainly be tumbling brass rifle cartridges with little stainless steel rods as media in a soap solution, so it needs to be water tight. I think the rubber liner is there for reducing noise and the think could be made to work without it, but it would be loud. The HF ones I have seen are too small.