Connector housing made of a soft material. It looks like polyethylene, Polytetrafluoroethylene (PTFE) or something similar. Capable of very easy machining. Radiology picture reveals more detail of the inside. It seems I can unscrew and after fixing the broken contact screw it again. Broken center wire is clear in the radiology picture. First attempt for unscrew by hand didn't work. It seems during assembling some kind of glue might have been used and need some sort of solvent to dissolve the glue to be able to unscrew safely without damaging it. Any suggestion for the solvent?