Wood Ball Knob kit for OE Grinders - fits all Lido including the OG, and the Fixie Travel Grinder.  This 1 1/2" (38mm) Hardwood Ball Knob is made from a standard ball, described as "Birch or Maple".  These hardwood balls are precision drilled and a magnet installed inside the ball.  So, all you have to do is remove your old knob (take off the silicone cover, unscrew the screw from the shaft) and pop the new wood ball on the shaft!    Each ball is a bit different with random grain and swirly patterns, they have 3 coats of varnish so they'll stay nice and bright.  Some have minor imperfections just as they came from the wood working company...  The ball comes with a curved washer that trims out the application a bit.