How can a shaded-pole motor be reversed?

Yes, the rotation of a shaded pole motor can be reversed. It is advisable to only attempt this on a small motor and if you have general mechanical and electrical knowledge. The simple and direct explanation is one has to flip the stator. To do this the motor must be disassembled to a point at which the rotor can be removed. Once removed, turn it end over end and reinstall. Done. Note that the bearing housing ends will likely have to be switched as well.