Bearing Standoff Washers for adding smooth articulation to moving parts - Parametric

I recently purchased a lawnmower blade sharpening jig from amazon.  The arms of this jig are overlapped joints secured with screws, spacers and washers.  There are no bearings and it's impossible to have a tight joint that still moves freely enough to use the jig.  In the comment sections, one reviewer mentioned that the jig is almost impossible to use and to search out the jig that uses bearing at the articulating joints.  

I struggled with this jig in the original form and decided that I wanted to find a way to add bearings to these joints so that I could have both a secure/tight joint that was easily articulated.  The included STL and 3MF files are for a standard 608 bearing.

I came up with this design in OpenSCAD.  

You will need to print 2 small standoff washers and 2 large “cup” standoff washers for each joint you add bearing to.  Also 2 bearings are needed for each joint.  Check out the pics to see the order and direction of installation.  Note, the bearings fit into the “cup” portion of the larger standoffs.

Short (<1min) video of the smooth movement: