It is a long time since I built a boiler. All I knew or needed came from a book by K N Harris : Model boilers and Boilermaking. It is available on eBay still I think
'If RDG Tools have bought all the Myford spares and the name, then that is a good thing I have dealt with them a few times and they have always been professional and very helpful.'
True, I have bought a couple of Myford items from RDG Tools and while their service was first class the items...