Brilliant machined tool, there are times when I wish I had a Lave and Welder, saw a post with someone and a self made tool but theirs was like a wheel jack. The normal existing tool for this job is fine unless someone has rounded the valve nut off.
Do you have another tool for removing an NRV that has already been burred on the edges to that the standard tool slips rather than grips? That is a tool I need, as I have two stoves I've purchased where the valve head is buggered.