So Hikin Jim,
I've loved my HR stove since the 70s, and as I had quite a stash of cannisters I've been able to use it for all these years, but alas, I'm on my last one! I've been reading all kinds of threads about retrofitting my dearly loved stove, and now I see in your photo the key to my quest! Where would I get the double threaded adapter shown in your photo? Any help you can give would be greatly appreciated!