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Killian,
The pics of the knob are great, but have you accessed the carbs where the extended idle adjustment screws into the carb assemble to see why it isn't turning? Have you shot some penetrant on it/tried turning it by twisting up close to where it screw in?
My guess is that it's bound up & just needs some lovin' to work like new. Feel free to replace it if you want, but that's kinda like having your colon removed when all you need is to eat some fiber...
Regards,
--Rich
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