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How about mounting an extra 500pF VC for exclusive use of the module, to a shaft coupler stuck (somehow) to the shaft?
But to be honest I think there is a different simpler approach that needs to be considered.
Why not couple a potentiometer to the tuning gang and use an FM receiver with varactor / varicap diode tuning of the sort that were common 30 or 40 years ago. What does the team think?
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Yes, I think that is a good idea, although it obviously depends on the set and the space to achieve it. There is no doubt that each set needs its 'own' approach and there is no 'one size fits all' solution. What matters most is being able to do it and keep the set alive and in use.