Hi, I picked up a couple of Kenyon Homestrand alcohol stoves a couple of weeks ago; one a 205 and the other a 126. I've replaced the cap gasket on both and pulled out the NRV on both. I have opened one of the NRV's and replaced the pip but it is still letting air out. The NRV only contained a spring and the rubber pip; didn't see a brass nipple thingy for the pip. Any advice on refurbing the NRV's. Would rather not pay $20x2 plus $12 shipping if I can avoid. Thanks!