 During the production of their next album, "The Eternal Idol", the lineup of Black Sabbath changed multiple times – first, Bob Daisley replaced Spitz on 30 September 1986, before leaving on 11 November after completing his bass parts; next, Singer left on 1 January 1987, with his drum parts completed; and finally, Tony Martin replaced Gillen on 1 March.Around the time of Martin's arrival, Bevan also returned to the band.Preparing for shows in July, the band briefly rehearsed with original bassist Butler, although within a few days he had left again and Spitz was brought back in his place.