Thanks Nophead for the reply.
It seems to have some chamfers around the edges
effectively creating a captured bearing along with the herringbone pattern.
BTW ,- its an honor to speak with you and thank you for your
incredible contributions to the reprap world.
Happy prosperous new year!
Cheers - Jon Dawe
Prusa I3 - Rework (home built)
w/ heated print bed. Borosilicate glass plate.
Ramps 1.4 board, Arduino 2650
Thermaltake 750watt power supply
Ulti-panel lcd controller
Marlin firmware
Cura - slicer/print software