Below is a photograph of a tool I can't identify (the one with the aluminium handle), underneath a tool that seems to operate in a similar way that is used to push panel-pins into wood, known as a 'push-pin'. Unlike the push-pin, the aluminium-handled tool has a central plunger that is flush with the sprung tube, making me think it is for a different purpose.
Does anyone recognise what this is (the aluminium-handled tool, that is)?
Surely for pushing panel pins below the surface after they have been knocked flush, or making a starting hole for a panel pin( if I have understood your description Mike)
I see – so the top (wooden-handled) one is for pushing the pin in, and the bottom (aluminium-handled) one is for sinking the pin head below the surface?
It might say BICC Burndy on it somewhere and it is for extracting pins and sockets out of small connectors. It's obsolete now as things are smaller and not alterable. That's progress. The pins (or sockets) for the plug are crimped to the wire ends and inserted into the body, retained by an outward facing clip on the pin. To extract a pin the tool (to be exact – it's outer tube) is pushed down the side of the pin to push the clip away from its retaining surface and further pressure brings the inner rod down onto the pin pushing it out of the moulding (the plug body). It works on the free wired plug or the socket on the instrumentation.