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You use the one that fits. I think it's the largest diameter plug and has a dark-blue insulating ring. When you attach it to the lead, make sure you match the + symbols moulded onto the side of the plug and socket where you connect them. (The socket on the end of the wire where you connect the plug is actually marked + TIP .) This will ensure you have the centre pin positive. If you have any doubts, if you have or can borrow a multi-meter then check to make sure.
Robert
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