Keysight N9021B MXA Installation Notes page 16

Option EXM, External Mixing Upgrade Kit
Figure 13 W17 and W29 Properly Aligned
5. Refer to Figure 14. Use a ¼" open-end wrench to prevent the SMA female connector on W17
from twisting. Use a 5/16" torque wrench to torque the nut on W29 to 10 inch-pounds.
Figure 14 Torque Cable W29 onto W17
16 Installation Note N9021-90004