A few years on my journey to get my TBW-5, I also picked up a nice LM-14 with power supply, cables, mounts, and calibration manual.   Decided to start working on it.

I feel rather sheepish about asking this question, but that beats feeling really bad if I bust something.....   Attached is a photo of one of the connectors.   How do you remove it?

It's inserted rather well, and I tried moving the small metal tab, rocking the entire cable with a screwdriver etc.  Won't budge.   The manual I have (for an LM-18) shows different connectors.

Mark K3MSB