Re: GPO Dial No. 21CA not quite "normal"
I've never had one that far off, though quite a few where I've had to hold the dial against the stop whilst tightening the screw.
I suppose you could cheat and put a bit of heat-shrink or some-such on the internal screw to fatten it up. Maybe it's worn down on one side and a slight loosening would help. Just guessing.
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