Many engineers are all too familiar with the task of changing switch lamps on consoles.
Over the years, we've seen improvements in console designs, the most recent being the use of LED replacement lamps. As you select a replacement bulb, note the polarity of the circuit. The LEDs come in two polarities for the most common bulb replacements. . . . Jerry found a piece of cable jacket from a large-gauge microphone cable. The cable brand and stock number are unimportant.