It's nice to keep things original, but better to make them usable. Let's face it, the definition of a microphone is 'something that records sound', and not 'a chunk of metal that lives in a box'. :-)
Like many old connectors, it is hard to find good quality used Melodium connectors, so here is a nice simple XLR upgrade for a Melodium RM6.
I removed the base of the microphone and cut off the old connector on the lathe. Then I turned a Neutrik XLR socket to fit into its place.
Solder three wires back in place and this RM6 is now ready to record music!