Jim
no, the dirt did not «come right back up», as you put it. Still, this was not as good as the internal pricker, and it was a relieve when I got the Optimus 155 with these improved burners. I guess one could say there was a reason for inventing the internal pricker (and the ‘throttle/shut-off valve’). However, adjusting the heat by increasing or relieving pressure in the tank, as on that butterfly stove, has worked well enough for me, since each burner had its own tank, pump and valve.
The standard procedure before shutting down a self-pricking burner on Johanna’s stove was to turn the valve knob fully ccw before finally shutting down by turning it fully cw. This ccw. action made the pricker protrude up from the jet, and this simply meant that next start-up would be trouble-free. I used ordinary kerosene, not fancy stuff ‘for soot-free and odourless cooking’, and the stove still worked very well for the 14 years I had it in Johanna. I have to add, of course, that I didn’t live on board, but on the other hand, I visited Johanna often, summer and winter, and the stove was lit just about every time.
Arne