A small update has been made to weapon and item registration in regard to implants. You can read the updated information
here.
Basically, characters are no longer charged for implants and other add-ons that do not have some manner of special ability. This means that pure replacements do not cost weapon points, so a character who loses a limb or an eye doesn't need to spend 10+ item points to return to a state of normalcy.
Questions can be asked here, via IRC, or in Ask Away. Existing characters with implants may reregister those items if players would like to do so.