I have an Isoma centring microscope that I use quite often. Originally they came with a fixed lead but I modified that some time ago to take a plug. The poor fit of the plug into the socket finally got to me, so in this clip I improve on my original mod.
Thanks to ‪@ThisOldTony‬ for showing the tap tip (   • Using a TAP as Thread Boring Tool  ) and also to ‪@isomagmbh8590‬ for making such a nice bit of kit