I've taken a serving tray, like the ones you get a Mikey D's or BK, and glued some waffle mat (shelf liner) found at the .99 cent store, to the tray. Now when I am removing ball bearings from either wheel hubs or the headset I make sure this tray is under what I am taking apart. If any ball bearings fall out they fall on this tray and not all over my garage floor. The remainder of the waffle mat can also be used to line the drawers of tool boxes so the tools don't slide around too much. Needless to say it is not earthquake strong.