I have spent a pleasant morning taking my spare spheres to Kevin Wright in Stockport to have them re-gassed. He does it not by welding on an adapter for a shrader valve, but through the pip at the top, as per the original Dunlop method. You’ll find his service offered on e-bay, have a look it interesting & has links to YouTube.
I’ve not seen any comments on here on his service, so I’ll report back when they’re fitted.
As usual my dog accompanied me & we went for a walk on our way back & found a wing mirror cover of some VW or other, can anyone think how I might repurposed it?