I am fitting a kitchen sink tap, it is a Deva tap with built in filtered water tap. As the threaded bar for the back nut is also the inlet tube for the filtered water then it has a 14mm back nut. All the long sockets I can find end at 13mm, there is no room at all for a small spanner so wondered if anybody has any ideas? The only one I can think of is bending the end of a 14mm ring spanner 90deg and trying to use that although do not know if it would fit over the nut with the normal tails fairly close.