I like this old No. 20 a lot despite its rough appearence. It's a good user. When I got it, it was just equipped with a crude and home made burner plate. It did its job, though, even if the flame pattern wasn't the best. Hot and blue however, and that's the main thing! But I like silent burners, so I made one myself many years ago with an existing smaller outer cap I got a handful of. I don't know what they were made for, but they are Radius, so suit this stove fine, and fit perfect in the burner bell. I just made a loose inner cap to steer and distribute the vaporised fuel, and it works very well.