How are ya, fella?
It's funny you should mention this as at the start of the week, and due to having a bad back at the moment, I tidied my desk up a bit and found the original drawing for the J+S tables.
The connecting cables (they called them umbilical cables) were a pain in the backside to make (I did all of them for the last couple of years we did the J+S tables. Those connectors are hideous to work with and I'd recommend replacing the ones you have with Amphenol connectors. The originals used a specially made adaptor for Anaconda conduit fittings and I doubt you'd be able to get them any more.
If you went Amphenol, I'd put a straight PMAfix fitting in the motor box on the table (28mm conduit available from R.S.) then replace the cabinet fitting with an Amphenol socket (MS3100A 28-11S should do it nicely). If you struggle finding a supplier for that, do a searh for a company called Temar - they do Amphenol stuff and they hold those sockets under this number: DMS3100A28-11S. If you ask for a plug to suit and a straight, threaded backshell for it, they'll sort you out.
The cabling was simple enough to sort out and I can let you know the pinouts and a recommended new layout for the Amphenol socket.
Does your machine have a servo amp and dual axis card in it for the table?