It would be a lot of design thinking but it would be nice if once the tool sits on the NRV you can sort of tighten it like a wrench to fit it snuggly so it will not jump out of the NRV head or perhaps put some knurling on the inside to hold it in place. Then again that might be an overboard idea Ron
It seems the only major problem with NRV's is when you do not get them out using normal force and a 'standard' tool. Several tries with bigger effort often lead to a damaged valvehead on which the standard tool rears off. That is where a 'closed-in' tool shows its worth, preferably before damage is done. All you want is that minute movement anti-clockwise, 'breaking' the bond which you tend to hear rather than feel. That's the only critical issue; once un-stuck you do not need whatever fancy gismo unless the thread is damaged all the way. In that rare case you need to unsolder the pumptube anyway as a new valve cannot likely be installed. As it appears most of these problem valves were installed without a lead washer, likely tightened extra for closure, it pays the effort to get those washers if you intend to keep using that stove for any lenght of time.
Not that I would bother as I enjoy pulling tubes but why not braise a washer to the nrv tool at a height where it would fit any tube. Then place more washers on that until they reach the top of the tube, then put the end cap on. The washers will center the tool and the cap will hold the tool down.
I have just received the two NRV tools this afternoon. These are quality items, very well made, and they have that great "feel" of a "proper" tool. I have just used the larger of the tools to remove the NRV from the Op.100R which I featured on CCS earlier this week. I had soaked it in releasing oil for a few days, so perhaps it wasn't a severe test....but the tool worked beautifully. Best Regards, Kerophile.
Stu, How can I get in touch with you to order your NRV tools? I have a Primus #51 stove circa 1952, and I am unable to get the NRV valve out. Thank you. ColemanEd Ed Franklin sib3@att.net
