About ten years ago, I was given this machine that my woodworking teachers found in another place. After trying to get the machine to work, I had to replace the electronics with new ones from Probotix store. Last year, the machine had to be moved from old shop to new one. After trying to get the machine to work, I had to replace old stepper motor drivers and controller board with new drivers and CNC XPro V3 board. Now, the machine wasn't working good due to white plastic bushings that worn out. The machine has 1" solid steel rods. The company that built the machine went out of business. I would like to replace the bushings with linear bearings but I don't know how to get linear bearings. Any suggestions?