Hi Ironbark,
All I want to make is a 20mm long M&F extension to screw into the head to allow the PT decomp valve to clear the head fins. I have some ally rod and a 14mm tap, I just need to get a 14mm dienut and I can make one up. Once the extension is screwed into the head there should be no reason for it ever to be removed. A mate is going to check and see if he happens to have a dienut in his boxes of stuff otherwise I will just buy one
