FWIW, we just used a screw driver to depress and hold the ball down, and then just poured water into it until it was as full as needed.
Of course, we didn't clean out the stale, so every now and then someone will push down the ball and we'll get a blast of that oh-so-yummy rotten beer/AZ water smell.
Although one keg did leak a little when dropped, so we just threw some 'Shoe Goo' on it to seal.
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