Looking at the spring contact plugs, it appears to be a convenience type plug - it doesn't have to be completely removed to disconnect- move barrel out slightly to separate from the tip - what do you think?
I don't quite follow. The plug in the close-up photo does not come apart.
I just finished going through the connectors section of a very large 1968 distributors catalog of electronic components that I recently acquired. There was nothing even close.
Do you use your test station, CW?
I have a 5D on a shelf just above my work desk. There are usually some trains waiting to be repaired sitting on the track. I use the whistle control test and the circuit breaker test. Unfortunately, I have to clear the tracks first. I don't use any of the other functions.
I have a Simpson 229 AC leakage meter that I use to check transformers for leakage.
I have a A.C. / D.C. power source with AC volt and AC amp meters built into my desk years ago.