Hi all, I just bought this peculiar little stove last week. In all its glory. The tank has a dent in the bottom, but nothing too bad. The patina layer is nice and even, I think I'll keep it this way. The name. GB logo is Gustav Barthel of course. This pump is HUGE, wow! And I also really like the loss-of pressure-vent-screw-preventor of what you may call it. The flame spreader does not look original. It's rather thin, and somehow attached to the head. I have not seen an original Juwel flame spreader on this site, so I guess no one really knows what they look like. A mystery? Also not sure if this is the original pan stand, but it fits pretty snugly on the legs. Too bad it's broken in two places. This thing is heavy! Cast iron, instead of flimsy sheet metal pressed in a pretty shape. Taking it apart. The pump assembly, with the somewhat warped rubber ring in the back. This ring was definitely not a viton rubber ring as it was very soft and probably dissolved by the kerosene. I could not bring it to pressure, so took out the NRV. Noticeably less of a pain in the backside than a regular NRV. Now for the challenge: How do I get the NRV to work properly? There was a lot of yellow flaky stuff inside, I presume it to be some disintegrated leather seal or something. I cannot get out whatever is inside this NRV, so for the time being it's being soaked in a little WD-40. When I pumped, the air escaped out of the two holes on the side of the NRV, but I fear the air/kerosene can return through those holes just as easily. Does anyone know what should be inside the NRV? Regular spring with a metal cylinder on top, topped off with a rubber or leather seal? I know Spiritburner has this exact stove. Can you help me out? Awaiting your reactions, and eagerly awaiting to fire up this old j(u/e)wel.