The BNC keyed holes punched in the front of the Acromag crate (LIGO-D1600135) are all 0.5". This means that none of the standard insulated panel BNC feed through fit (the in-line types are all 9.7 mm), I seem to only be able to find the 0.5" in the PCB mounted right angle BNC receptacles. Right now all that is holding the current BNCs in from rotating are lock washers and almost INHUMAN TORQUE FORCES.
Johannes had a 4-channel BNC to Sub-D 9 that he had procured from Downs (Old DCC D090415).
However, this part is now obsoleted and they have run out. I made a quick board layout in Eagle (attached below with all of the Gerbers files). I added male and female sub d receptacles and included an optional screw terminal breakout. We often need quick break outs for multiple BNCs and end up making dangly octopus creations. We might as well have a bunch of properly made breakouts.
If there are no objections I will order a small batch some time next week.