[Drake] R4C no calibrate

[Dave Edwards]

Can anyone shed some light on this....Like several other old rigs, you calibrate by zero beating the calibrator, holding the tuning knob, and turning the skirt.  Mine always worked that way. 
But...after having been off for several months, holding the knob and turning the skirt will not move the dial. Only turning the main tuning knob moves the dial. 
So, something is stuck to something (I suppose) 
Can anyone figure what is not happening, and what needs to be done?

Thanks, and Happy New Year to all!!!

.....Dave
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