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To change the coil on the Aspire Tigon tank: Unscrew the base, pull out the old coil and replace it with a new one, screw the base hardware back on again.
For the Tigon AIO: Twist the Pod 90 degrees and pull it away from the device. After swapping the coils, drop the tabs back into their slots, and rotate 90 degrees until it stops.
Coils sold individually.