The Wooden Pickle: Linear Bearings & Ball Screw

Something a friend of mine is working on...

The Wooden Pickle: Linear Bearings & Ball Screw: "Slides: 30mm diameter, ~33' length THK Bearings: blocks are 5.5' and 2.75' in length Screw: 15mm diameter, ~22' usable length 20mm/rev. tra..."