OK, I will bite.
The tool which I show here is not the most sophisticated thing you could think of bit I made it myself and find it very useful.
It is a tool inserting (and removing) pins from matrix board (eg Veroboard).
I made it in my lathe from a spindle removed from a scrap printer.
The end diameter is reduced to give clearance between adjacent pins on a 0.1" matrix and the end face is drilled with two holes.
One of the holes is about 5 or 6mm deep and is used during pin insertion operations, the length of the pin up to the shoulder is supported by the tool.
The other hole is just 1 or 2mm deep and is used to push pins out of the board if I want to make changes (or just plain get it wrong!).
The rod is then inserted into file handle to give it a safe comfortable grip.
JimB