Actually, the yoke carries very dangerous voltages (and currents). Specifically, the horizontal deflection winding is the one that can give you a serious bite. I treat the yoke with a lot of respect.

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I stand corrected. I was assuming the horizontal circuit was like a Mac Plus, which carries about 16 Volts on the yoke coils. In any case, break the glue or age stiction before turning the Mac on, and adjustment will be easy. The horizontal output transformer on the analog board IS dangerous, as it supplies the high voltage for the CRT.