[ARC5] ART-13 frequency fine tuning B does not lock

[Nico van Dongen]

Hello, I have a nice ART13 with one small problem, the right most fine
tuning knob B does not lock. It makes no difference on how tight I turn the
center knob it always slips.
Is this a known problem on this set?

Thanks,

Nico - PA3ESA
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