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  You can easily build this 4 barrel tumbler using readily available materials.  With this tumbler, you could polish 40 pounds of rocks in 4 different stages at one time.  Or, you could use it as a ball mill to mill 4 different powders at one time.
4barreltumbler.jpg
This tumbler is constructed almost entirely with a wood structure and no precision cuts.  These instructions are not blueprints but rather instructions and assembly pictures.  It comes in the form of a PDF document to be emailed to you, no waiting.  The barrels are constructed of ordinary PVC pipe and fittings all of which are available at most hardware stores.  The barrels pictured have a capacity to tumble about 10 pounds of rocks each.  A hardworking person could build this tumbler in about a day's time.  The price is $12, no shipping charges, of course. 

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