I have a real stumper for you guys. We have an 7T (300 MHz) NMR in our lab that recently quenched – the superconductors went normal and we lost all our helium. That is can be pretty bad for a magnet, but we think ours got through it without significant harm. We have been getting it back up and running but there is one point we are stuck on. We need to get the superconducting shims operating, but there is a single shim (Z2) that we don't know the proper pinning for. The rest of them we know exactly but that last one has us stuck. The only pinning information we have has nothing about Z2 superconducting shim, though we know we have one. Our best guess is that the z2 shim is activated at the same time as the main coil, though that seems really odd. What makes this all the more frustrating is the fact that there is no model number or make, printed on the exterior and the only the only documentation is for related machines - again without names. It was put together by Varian, though they don't have documentation for it any more. It is 13 or more years older. The magnet itself was made by Oxford and the internal dewars by Kadel Engineering. Does this look familiar to anyone ?