I launched a Semroc Centurion today with a Quest C6-5 using one of the Q2B2 igniters. My launch system was a Pratt Hobbies Go Box connected to a 12-volt tractor battery. The Go Box uses a buzzer to indicate continuity, so perhaps that's why it didn't fire when I put in the continuity key.
BTW, I like the long burn on those Quest C motors!
timmwood

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NAR 60014, Level 1, SAM 124