One may argue that the core due to its smaller size is more heat sensitive, but other PC connectors are soldered too.
When I put it back together, the concentric ring with the tab to which the earth return wire is soldered came away from the rear of the socket. It looks like when the socket is removed, there's no need to desolder anything; merely a case of loosening the live screw and lifting the concentric ring with tweezers, then loosening the notched nut that secures the socket to the bezel. I wondered if the ring should be sintered to the socket? It's not likely to be disturbed where it is, anyway.
I couldn't find a suitable screw, so I just soldered the blue (live) wire to a tinned short length of solid copper wire that fitted snugly into the threads, soldered it to the socket live connection, and bent it over at 90 degrees so it doesn't short to earth on the casing. It works! Well, it reads short-cct when I meter across the flash sync socket and fire the shutter on 'B'. I'll try it on a flashgun next week. Light meter works too and the black plastic ring popped back into place easily. It's channelled, so as long as the sliver of insulation is beneath the LDR connections, there's no need for any sleeving - as long as the wires aren't of equal length and likely to touch.
