I noted a picture in your Medea log regarding one of your father's tools that you hadn't identified.Richard, if you ever get to Bristol, there is a model in the museum there of HMS Medea, an Enterprise class 28. I haven't seen it myself but have photographs and a book about the builder (of the ship and the model). I can send more details if you want.
It is piano technician's voicing tool. We use them with various numbers and grades of needles/pins to alter the density of the felt on the hammers when adjusting volume and tone. Looking at your example and the thick needles, I'd say it was for heavy use, so probably used at a piano factory when the action is first installed and the hammers may require more aggressive needling.
