There is a discrepancy between the component overlay diagram and the photo of the silkscreen markings in Fig 4 of the Christmas Tree article in the November 2020 issue where LT and CK are swapped. If you compare it with the schematic in Fig 3. pin 5 is LT and pin 6 is CK which agrees with the component overlay. It is the same with the USB Digital and SPI Interface board. So it would seem that the silkscreen marking is incorrect. Could anyone confirm this?