Vintage Colibri lighter - weird butane refill port??

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Hello guys, I'm having similar problems with a vintage colibri, so I thought I could ask here. I can't seem to refill it properly, minimum flame height, I empty it of air, once the hissing stops I put the valves together, but then it leaks no matter the adapter (unfortunately i only have plastic ones provided with a can). It seems to kinda work without an adapter, but it leaks sligthly and there is quite some gas blowback afterwards. I tried it a couple of times and once or twice the flame worked for about 30 seconds before fading out. I gathered from this that it's either dirty plumbing or that the tank isn't filling properly and blowing back most of it. Is it possible there is a gasket or something missing from the valve?