In Post #8 above I said
"I've no idea how the black switch component fits onto the tuning spindle and don't want to force it!"
And of course after several nights using PlusGas with no progress I did decide to exert a bit more pressure and guess what - although I now have some movement of the tuning spindle independently of this black switch component I did also manage to crack the thing and two of the '
teeth' broke off!
If ever there was a candidate for 3D printing then this must be it - any volunteers? Superglue or Epoxy will hold them back in place but will that be enough to withstand the rigours of waveband switching?
As I mentioned I have some movement but turning the tuning spindle is still extremely difficult and tight so I'm hoping another couple of nights of PlusGas might help?
I was hoping that a Forum member who has restored one of these sets might be able to offer some advice, guidance and insight?