The title sums it up pretty well. I tumbled the inside of a 12 ounce bottle for about 3 days. It opened up a bubble and a single copper pellet is now lodged in the burst bubble. The weight of the copper and the tumbling action have it smoothed over & stuck down deep. So far have tried every bottle brush I own, a straw, chopstick, shaking copper in there...no luck. Any suggestions?