Breaking News! I have been invited to demonstrate the couplings at the Birtley show (Gateshead) on Saturday. I will be demonstrating how to select, build and install the couplings. I will have a few packs of both the 7mm and 4mm versions with me if anyone wants to pick some up face to face.
Also The first ordered couplings were shipped out to the new owners this afternoon. I will be posting out more over the next few days.