"Daphne + Dave" wrote in message news:OQSXc.234943$J06.164403@pd7tw2no...
Will WD-40 work?

Only if you want to destroy the control. Try, at the very least, Tuner/Control Cleaner & Lubricant
sold at RS. Better yet, get a quality cleaner like PUREtronics Contact Cleaner.

73 de Glenn AA5PK