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Hi James - I see your dilemma - in all honesty I have never come accross this problem before - knowing renault there is probably a special tool for the job. Is there any way you could grip the inner ring of the cap and turn the inner spindle using an allen key. Otherwise the only thing I can think of is a deep socket that has external flats or hex that could be gripped with a spanner.
Currently in madnoel10's garage:
Honda Civic 1.4l