I have just tried mine again. The switch turns fairly easily but the knob is so uncomfortable! Even after 28 years the edges of the 'serrations' in the knob seem sharp and my thumb is quite red from operating the switch a number of times. What's more, the knob is held onto the shaft by a rivet, not a grub screw! Clearly we are meant to suffer, wear gloves, don't go out in the rain or a combination thereof!
David
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