VPI JMW 9 wire problem

I just bought a used VPI Aries Scout with the JMW 9 tonearm.  It sounded great and everything was working fine until I decided I had to try and optimize antiskate.  Perhaps I misunderstood how that was supposed to work because when I rotated the plug to try to add more twist to the wire the wires seemed to slip in the connector and now I don't have my right channel and there is hum.

I'm afraid I may have pulled a wire loose inside the connector or even worse inside the tonearm and I can't find any information about whether this is something I can fix, or if I need to have somebody else to repair it, and who that somebody else might be.

Any suggestions?  I live near Seattle if there is anybody local that might help.