If I were to order a Luna now, could I send my currently owned Cera EO cartridge in to TET for sizing to my Luna without sending my Luna body back? I ask because I would like to avoid a period of time without an EO cartridge in my possession. OF, do you know if the shim/washer is a modification to the cartridge or the luna body? I guess if it's for the body, it'd be necessary to send it in with the EO cartridge for fitting in the future. Thanks.