I have a 9V wire with connectors. The wire has broken where it enters the connectors. I have been told I can take the 2x2 connector apart and the wires are just clamped in position. How do you take them apart? - I assume it is easy if you know how. I have read that I just need a small flat head screw driver. Is there any more advice please maybe with photos of where to put the scredriver(s). Thanks.