Tri City Departure: Cessna 12345, squawk 4305
Cessna 12345: Tri City, um, we just noticed we are missing the knob for the last dial on the transponder.
Tri City Departure: What number is it on?
Cessna 12345: Zero
Tri City Departure: Standby, let me see if I can get you a code that ends in zero.
