Hello Optimal! We have the last remaining parts for the following Nikon autorefractors/autorefractor-keratometers: NR-5100 autorefractor circa 1986 NR-5500 autorefractor circa 1994 NRK-8000 Autorefractor/Keratometer circa 1994 We have elected to discontinue support for the 5500 and 8000 units starting January 1, 2014. Curiously enough, we will be able to continue some support for the earlier model for quite some time. Please place orders for fixation bulbs, batteries, covers, power supplies etc prior to the Christmas holiday to ensure availability. Please note we are no longer supplying replacement joystick cables and are instead supplying used, 100% tested complete joysticks until supplies run out. Calibration service on the model 5500 and 8000 units is limited to adjustments only, full calibration is still available for the 5100 model. Thanks. -- Regards, Mark D. Forman Long Island Ophthalmic Service, Inc. 442R Smith Street Middletown, CT 06457 Mforman@xxxxxxxx V:631.874.2525 V:860.342.8026 F:631.874.2560