My black SXK 60W from FT finally gave up the ghost yesterday. Had suffered from the fading wattage/no low battery warning problem. I'd wire brushed the threads, and sanded the mating top plates but no joy. Now it just asks me about new/same coil, but doesn't get past this page and doesn't read the resistance. Guess it's borked :-/ Still, my SXK rDNA turned up today and so far loving it!