I finally safe up enough to upgrade my OX CNC to ACME 8mm lead screws for my X and Y axis. I bought a OX CNC 8mm Lead Screw 7-piece Upgrade Kit from chrisclub on ebay and they came in today and the pieces are well made. I order the rest of the parts from openbuilds store and Home Depot. I bought also awhile back the 11" tall Y gantry plates.