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FYI
Putting several pillow cases full of brass in your dryer is very effective, and loud.
Forgetting to remove said brass before the spousal superior returns home is also VERY LOUD.

I'm not familiar with the Maguire, but I try to remind everyone - be careful with any compounds which include ammonia. Ammonia will weaken brass over time.
Even though media is cheap, I'm cheaper. To make your tumbling media last longer, cob or walnut, tear a used dryer sheet into quarters and throw it in the tumbler. Change it out when it's black.