In the past I have tumbled clad and small relics in a cheesy kids-style plastic tumbler from a thrift shop. A couple months ago I had a little money fall in my lap and bought the dual Harbor Freight tumbler. The instructions mention avoiding the slurry effect, which i think means having it packed so full that the media isn't passing over the metal items constantly, more like everything becomes a sludge that just spins around. I am having pretty good results with coins but sometimes not so good with small relics. Looking for tips on how much media to metal items to water you use...