I don't think a pencil will help these days Ellie! This stuff would be a better bet :
https://www.ebay.co.uk/itm/9893-MANN...n/303081768191
Squirt it into the offending potentiometer and "exercise" it like i described above. 
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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