These 3 pin sockets are used by Seaward on some of their PATesters, in this case an Apollo 600. I need to make up some leads but I can't find this socket listed anywhere. Anyone recognise them and point me in the right direction for some plugs? The socket is about 13mm diameter. I'll be taking the tester apart tomorrow to see if there's anything moulded into the sockets but if anyone recognises them it'll save me a job

