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Next, take two laser diodes (the third one in your kit is a spare) and strip 1/4" (6 mm) from each lead.

Attach lasers to the labeled solder pads "Laser Diode." The red wire is positive and the blue one is negative.

Solder these onto the board from the front. Use minimal solder and minimal heat for these connections.

Be very careful to not create a solder bridge between the two connections, as this will cause an electrical short.

Use diagonal cutters to cut of extra wire and solder.