Methods and devices for remanufacturing printer cartridges are provided where the printer cartridges comprise a photoconductive drum, the photoconductive drum comprises a drum gear end, and the drum gear end of the photoconductive drum is configured to be attached to a laser printer via a rotational force transmitting assembly. To that end, the firewall includes an input module that receives data addressed to a given computer system in the power integrated network, a security module for determining if the data received at the input module can be forwarded tot he given computer system, and a power module to power both the input module and the security module. The male segment also rotates in relative to the female segment; meanwhile, the head is rotate along the fastening portion.