Thanks Spiesy,
I just had a look at that and it appears that it is a piece of s/steel tube with a stone fixed to it by a piece of plastic.
Unfortunately that is what I am wanting to avoid...the piece of plastic to join the tube to the stone.
I have tried a threaded stone with a John Guest fitting and it is not really suitable as there are too many little crevices for gunk to hide in.
I have tried the s/steel tube with a small piece of beer line and a stone with a barb and that is much cleaner but the barb can fall off when I boil the assembly for sanitising because the plastic gets soft.
I would like to buy off a local if possible but may decide to go to More Beer in the USA if absolutely necessary.