Just obtained a Primus 51, my first of this classic type. Stamped "AB" on the bottom, so if I'm doing the math right that means made in 1946, right? I first notice this style stove in various historical dramas, such as those covering polar expeditions. Very cool that the design has lasted so long. Kind of like revolvers in the firearms world, and turtles in nature. All designs that are not flashy, and which have been taken for granted long before the oldest person living today. Some would argue these have all been surpassed by more recent designs. Yet they all just keep plugging along, monotonously achieving their design purpose, year, after year, after year. That is my definition of a successful design. I've been reading up on the type here, and watching various youtube videos (e.g. BernieDawg), but I'm still pretty much a newbie to stoves in general, and definitely a newbie regarding the Primus. I've go the following questions... if anyone cares to educate me. This burns only kerosene, right? Or are there other fuels that are safe to burn? I don't understand how the fuel, which starts as a liquid in the bottom of the tank, gets transported to the burner. A Svea 123 uses tank pressure, but also a wick, to get fuel to the nipple, but this doesn't have a wick. I can only assume that the stove relies on vaporized fuel in the airspace above the liquid fuel. If so, then apparently that doesn't work with the white gas in a Svea 123. Why not? Rather than controlling the output of the burner directly with a valve that limits the flow of the fuel to be burned, this stove controls the flame by bleeding off the pressure that is forcing the fuel into the burner. But I'm thinking it isn't just air that you bleed off, but vaporized fuel too. Since this is venting just a few inches from the burner flame, doesn't that present a fire risk? And if it really is venting fuel vapor, isn't that wasteful, and polluting? Clearly I have a fundamental misunderstanding somewhere. The ring that sits on the three supports has six indentations for the tops of the supports. Every other indentation has little ears which presumably can be crimped around the top of each support, to prevent the ring from falling off in use. I assume this feature is meant for people who set this up in a more permanent situation than a camper would be in. Is that right? My understanding is that there is a rubber pip at the bottom of the pump tube that holds pressure. Is this considered a NRV? Given the stove is 73 years old I don't plan to test fire it until I've replaced that. Any recommendations on the best place to obtain parts and tools for this? I see Juliands on ebay looks to have what I'd need. That's all that I can think of for now. Probably have more questions later. Thanks in advance for any information you care to send my way.