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I finally got this working. My Trigorilla board is a version 1.1, which does not have the Servo0 (S0) header. I tried the other servo connectors shown in the linked video and couldn't make it work with this type of micro switch. I tried using the Y-MIN endstop header (with the firmware set to FALSE and #define FIL_RUNOUT_PIN 14) and it worked the first time.