The exchangeable mask cabine
The exchangeable mask cabinet with slots for 23 multislit masks. The holes in the separator plates reduce the total mass of the cabinet. The brown parts are made from Vespel to reduce friction and wear debris during mask insertion and removal. The two ball bearings mounted in the piling at the front end of the cabinet body interface to the drive screw. Identical units are attached to the back end of the body and to the end of the drawbar. The latter is required because the cabinet is shorter than the distance between the drive screws in LUCIFER and in the auxiliary cryostat.