Again from the 1928 house, rigid conduit and cloth and rubber wire. The 4S boxes have an older pattern of screw sets for the cover plates and the mud rings. Instead of the screws being on opposite corners, they are about 1/2" from that point. And I will be needing to source coverplates and extension boxes to clean this mess up as I pull fresh thhn. Is there a particular argot for this pattern? And is there still a source for this pattern?