Hi there, The fisrt nut which is pressing the olive on the union has been found at automec, the link is here : https://www.automec.co.uk/products/brass-nut-wiper-rack-9-16-x-24-unf-5-16-pipe Thank you Mgcjag for this link supplied. Clearly, the 9/16'' with 24 threads is not easy to find. After sever...