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Leo,
I am not aware those motors have clutch.. I opened couple of them in the past (to re-arrange the coils, I wanted to turn it into bipolar to use Pololu drivers) and there was nothing like clutch inside.
However, if you turn the output shaft too hard, the rotor could start to rotate through gearbox.. or if you are unlucky, the last gear may become loose from shaft (it is hot-pressed onto knurled shaft) .. and then the motor is basically destroyed.
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