NRV removal

I’m trying to remove a dodgy NRV from a 1927 Primus 97. The tool I normally use is a sloppy fit over the valve head and I’m afraid of rounding it off. Is there a remover with a slightly narrower socket for stoves of this era? Or - any suggestions for improvising?

 

I like making my own tools and I don’t have a workshop. I looked up this problem just out of curiosity in this new universe in which I find myself.

i found this :-
Home-made Primus NRV tool

which leads straight back to CCS.

 

Thanks very much for this link - looks really promising

 

Let us know how it works out.
Best,
Pat.

 

@brassed-up
Let it soak a couple of days in a 50/50 mix of acetone and Transmission Fluid. Works wonders