They selected the Rage Against The Machine man from a shortlist drawn up by producer Rick Rubin � which included Ginger Baker � after Tony Iommi ended negotiations with original sticksman Bill Ward over his return.

But Geezer Butler admits they thought they'd chosen the wrong man for the job at first. The bassist tells Faster Louder: "We literally had two weeks to work with him before we recorded the songs. The first week we were going, 'This guy's just not working out,' and we were panicking.