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How to solder analog audio to case jack?

The 3.5mm TRRS jack of my Tinkerboard (the old one, not the S version) is a through hole socket. So I tried to find the R,L,GND pins. R and GND are no problem, L is passing to the attached cable only for short moments. So either there is a capacitor hidden inside or the plug detection is distorting the pin.

How can I solder the audio pins to an external jack that is screwed into the case side, so that I can plug it from outside the case?
Just soldering R,GND and the floating L pin led to distortions without audible music. Plug detection working not correctly? Huh

Plugging directly into the TB's TRRS jack works perfectly, but with closed case this jack is not accessible.

Best regards

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