These are my notes on how to assemble the Sabre Lite case.
Before starting the steps below:
• Unscrew the 4 screws holding the case together.
• Ensure there is no SD or microSD in the board.
• Clean the top of the CPU with an alcohol wipe / cleaner.
• Orient the heatsink correctly for best air flow.
• Remove the protective plastic from the heatsink and apply firmly to the CPU.
When handling the open / unscrewed case, please be careful not to apply too much force to the walls. If one does crack, a little Cyano Acrylate / Superglue will weld it back together quickly and easily.