Hi! I'm not 100%, but I thought the spectralight machines were essentially rebadged Sherline machines? www.sherline.com sells replacement parts for their machines. I think you can buy a new spindle and controller there. Stepper motors are fairly cheap from ebay (keling 280 oz-in motors are decent) and they also sell stepper motor drivers. Hobbycnc and xylotex drivers are also popular. I wouldn't pay $1000 for a new pc card.