Any boards that the big paper shredder could not handle were broken down, it's this shred that will do the work.Are you using abrasive media in your tumbler or just letting junk work on itself?
No other media required, the trick is to run the mill dry.I like your ingenuity, let us all know how it works out. You may need to add some silica sand. Crushed will be more aggressive then beach sand.Good luck!
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