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Carefully disassemble the powerbase. The buttons push on little metal discs that are held in place by sellotape. Take off the sellotape for the central button. clean the board and the underside of the metal disc with lighter fluid. Use fresh sellotape and re-assemble

RichG said:

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If I can remember... its one of the two vertical metal discs at the bottom of this picture

I've probably got spares if you lose it...