crwdns2935425:010crwdne2935425:0
crwdns2931653:010crwdne2931653:0
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Next remove the inner button (black circle)
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Now remove the centre screw (red arrow)
crwdns2944171:0crwdnd2944171:0crwdnd2944171:0crwdnd2944171:0crwdne2944171:0