Hi, I suffered a failure of my stove's ErgoPump. The leather cup tore beyond any repair. As I am on a bicycle trip and always equipped with a pump, I fixed that using a valve from an old inner tube: full size: http://north-south.info/en/photo/primus-omnifuel-cycling-variant,640/ I hope the picture is self-explanatory and might help someone with similar problem. A bike pump requires less pushes to get the correct pressure (mine takes 2 pushes with full bottle, up to 6 while almost empty). Easy to overpressurize, which causes HUGE fuel consumption. PS: Where can I get a fresh leather cup without paying for entire expensive Primus repair kit?