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jamie look here Hickley Valtone :: Find the Key you Need
as far as i can tell they are a parts supplier.
NCS - Systems
these either stock or manufacture the sigma...you could try to contact them with with your problem...maybe its a common fault they can help with.
with luck another member will have some ideas how to help you.
sorry i can't be of more help.
Currently in bonedavid's garage: