I am undertaking the replacement of the wire harness in an SME ca1. The joints between tags and the original wires looked to be in poor condition so I decided simply to replace all 4 wires in their entirety. So far, the task has proved to be straightforward with the proviso that it needed some care and consideration. I’m about to solder each of the 4 new wires (30awg, Litz silver) to the pin plug found at the back of the carrying arm. I read elsewhere online that the plug can be susceptible to heat from a carelessly applied soldering iron tip and wonder if you, dear reader, would care to offer advice?