It seems that nobody has posted one of these before on this site.
I was surprised when a search revealed no results, because, although obsolete, itís quite a popular novelty item( like candle holders-which I donít make either)
I was mainly sanding things in the workshop, but had the fire going to keep warm, so using the latent heat, I would tap this into shape gradually, over the course of three days! So I did not use the air pump. As the fire diminishes, I shovel the glowing embers into a lidded steel box, and thatís my charcoal for when I want a white/yellow heat.
Itís made from a worn file. Although ergonomic, I do not care for the shape much, itís a bit of an abortion, if youíll pardon the allusion.