i have to see if i can borrow a drill.. because this could work... and if not then what?... another broken .55 cent bottle.. a little juice spillage ?? (actually if you think about it .. this would cause a big mess if the bottle breaks somehow,, lol) its worth a try.
Well, you don't necessarily have to hold the cap while activating the drill. If it's in the chuck good enough, I don't see really any potential of it exploding, unless, it escapes the chuck, and flies across the room
I think another key to this method is to have a chuck that is deep enough to encompass half, or more of the bottle's length. This would further ensure that the bottle doesn't escape, lol.
I should note: These unconventional methods that I might offer aren't to replace something say like the Sonic Jewelry Cleaner. They're just ideas for people who wish to have a quicker mix time, but are on a budget (thus why I mention items that may already be owned).