Might be a plan to give LiPS a call, they used to do a lot of Crossfires, Jon will know how they work and unless it needs anything like pistons or springs replaced should have no issue giving it the once over. They can remove the reg and arrange for the bottle to go to H-Pac too - 01707 325008
I think that since Kee took over the distribution of Crossfire they have concentrated more on their own products than 3rd party ones.