We all knew you would get it in the end :)

Well after giving me the run around for a few days I think I've got to the bottom of it. I swapped out my valve block for a re-furbed one I had on the shelf, and also cleaned up and renewed the o rings on the drier that I observed bubbling with...

if I still had my equipment I would, it use to be my profession in the days of yore.....

Keith I am not sure if my memory is right but didn't Kurt sell the NRV's? I bought a couple of sets a few years back but for the life of me I cannot remember from who and I cannot find the invoice/payment details

Very light pressure needed. Lathe is best, you can use wet or dry 600 grade instead of a file if you prefer but maybe when you get the valves out they are OK.