Thrustmaster VIPER TQS Manual page 26

Uninstalling the AFTERBURNER stop
The stop of the Afterburner module is positioned at 80%
of the value of the axis.
If you need 100% of the throttle's travel without a stop
(for a particular simulator), you can remove the
Afterburner module and its stop by unscrewing the
module's two screws using an Allen key (not included).
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