To set zero thrust the manual has this to say,
SIMULATING ONE-ENGINE-INOPERATIVE (ZERO THRUST)
When establishing zero thrust operation, use the power setting listed below. By using this power setting to establish thrust, inherent delays of restarting a shut-down engine are avoided and almost instant power is available to counter any attendant hazard.
1. Propeller – 1600 RPM
2. Power Lever – Set 100 ft-lb torque
NOTE:
This setting will approximate Zero Thrust at low altitudes using recommended One-Engine-Inoperative Climb speeds. Because the differential rudder boost system may not activate, rudder forces may be higher than those with an actual engine failure.
If that is zero thrust
Connedrod, what do you reckon a TQ setting <100 ft-lb would give you?