I just discovered a bunch of unopened/unused balls. The "can" has lost some pressure since it is easier to press in than a new can. The balls are unused, so I'm wondering whether I can use one of those ball savers to "pump up" the balls to bring them back up to "as new" status. I thought I would ask here before buying one of those gizmos. If the verdict is "don't bother" then I won't waste my time/money on one. If does work, it would be useful since I've got about a dozen cans of balls. Thanks.