Gear Head Motors by Lynxmotion

Hello, does anybody have any experience with gear head motors sold by Lynxmotion, more specifically GHM-04 and GHM-05? The GHM-04 has an
external motor shaft for adding USDigital Encoder. Do you have experience with this encoder? Has anybody tried to use the USDigital encoder with GHM-05 or any motor without the external motora shaft? I would like to know whether it is possible to hack the motor without the external shaft to be able to attach the USDigital encoder to it. Any information is appreciated.
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