The force required to lock a rotating motor shaft is called “stopping torque.”
(This is the motor’s instantaneous maximum output.)

This is the maximum torque value on the spool shaft, calculated by multiplying the stopping torque by the gear ratio (reduction ratio) to the spool.
(The winding force at a position 1 cm from the spool shaft.)
*The image is a conceptual illustration of the reduction mechanism. It differs from the actual product structure.