Grip the pair of boards and flip them over while applying slight pressure, holding them together so that none of the components become unseated.
Locate and fasten three M2.5 × 6 mm pan head machine screws to secure the Assembly Template to the Main Board, sandwiching all of the loose components and the Assembly Spacer solidly in-between them.
Now solder all of the loose through-hole components in place. There are a total of 16 components with 58 solder joints.
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