if you are using the residential then gardiners don't do the seperate sections for them.
You can add a little lacquer to the worn part of the pole or for all the cost of them you could go for a new exel extender or ecoline - personally I'd go for the brodex eco-lite every time, more expensive but probably one of the very best poles on the market - also has an alloy basecap so you'll never need to replace it again, it also comes with duralok clamps which give you a much longer lifespan for the pole, so in practice the pole is lighter, more durable, easier to use, and works out better value than just about any other pole on the market.
£129 + VAT