Old philips stereogram

Hi all

New member here.
Ive got an old (1960s?) stereogram.
But the selector dial between phono ratio etc is stuck. Ive tried spraying wd40 but doesnt move.

Do i need to open up? And how?

Thank you all!
 

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Open the cabinet, spray the switch from back and allow 24-48 hours for WD40 or similar to penetrate and free up the switch.
Otherwise you will have to take it apart, clean, lube, reassemble, connect all over again.
Not for the faint hearted or inexperienced.