Well, it's an original BM4 ammeter, so the 'connectors' comprise two molded bakelite tunnels with a brass screw clamping the leads in place. I have soldered the ends of the cables, filed the finished ends to the shape of the slot they have to sit in, and tightened down the brass screws to hold the cables in position. Not a lot more I can do, really! The cables sit down in their slots in the 'tunnels' so there's no protruding metal parts, but silicone boots or anything similar cannot be used in this case - see pic
