In the field of laser printer toner cartridges, systems and methods for removing a drive gear from an original, spent photosensitive drum or member, preparing and re-installing the drive gear on a new drum surface roughening, cleaning, contact straightening and priming of the original gear; cleaning and laser etching the new drum; gear positioning and adhering the gear to the drum with an epoxy/amine adhesive, electrical continuity testing and curing of the gear-drum assembly.