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- Eric_J2358
If it remains stationary with light torques and changes position with heavier torques, either the motor mount or the shaft the other pulley is on - or both- are probably just flexing under torque. It sounds like you're fine. Maybe check the motor mounting bolts and any other mounting bolts related to the motor and pulleys to make sure they haven't loosened, but it's entirely possible that you just have a normal amount of flex under torque.