I have just purchased a new radiator neck from Snyders in the USA, sent it to the radiator repairer who did a great job of replacing it. The only trouble is none of my radiator caps will screw into it. I have tried an original popes hat, a dog and bone with motormeter and several other caps, the best I can get is half a turn into the neck before it binds up.
Does anyone have access to a tap big enough to fix the thread in the new brass radiator neck? Please advise ASAP