“It’s the vibrator that’s out of order,” said a voice behind them; they whirled around; Galt was struggling for breath, but he was speaking in the brusque, competent tone of an engineer. “Take it out and pry off the aluminum cover. You’ll find a pair of contacts fused together. Force them apart, take a small file and clean up the pitted surfaces. Then replace the cover, plug it back into the machine—and your generator will work.”
