Slip a piece of heat shrink over the first laser's red power wire. Solder the first and second lasers' red power wires together.

Slip a piece of heat shrink over the third laser's red power wire. Solder the third and fourth lasers' red power wires together.

Cut, splice and tin two pieces of wire that are approximately 190.5 mm in length.

Solder one of the ends of the 190.5 mm lengths of wire to the solder point between the first and second laser. Then, solder the other end to the solder point between the third and fourth laser. This connects the first four laser's power connections together.

Slip a piece of heat shrink over the seventh laser's red power wire. Solder the seventh and eighth laser's red power wires together. Solder one of the ends of the second 190.5 mm length of wire to the solder point.

Slip a piece of heat shrink over the fifth laser's red power wire. Solder the fifth and sixth laser's red power wires together. Solder the other end of the 190.5 mm length of wire to the solder point. This connects the last four laser's power connections together.

Cut, splice and tin a piece of wire that is approximately 242 mm in length. 

Solder one of the ends of the wire to the solder point between the third and fourth laser. Then, solder the other end to the solder point between the fifth and sixth laser. This connects all eight of the laser's power connections together.

Cut, splice and tin a piece of wire that is approximately 58 mm in length. Solder one of the ends of the wire to the solder point between the seventh and eighth laser. This wire will eventually connect to the on/off switch for the lasers.

Slip a piece of heat shrink over the first, third, fifth and seventh laser's black ground wires. Solder the following laser's black ground wires together:

• First and second
• Third and fourth
• Fifth and sixth
• Seventh and eighth

Cut, splice and tin two pieces of wire that are approximately 190.5 mm in length.

Solder one of the ends of the 190.5 mm lengths of wire to the ground solder point between the seventh and eighth laser. Then, solder the other end to the ground solder point between the fifth and sixth laser. This connects the last four laser's ground connections together.

Solder one of the ends of the second 190.5 mm length of wire to the ground solder point between the third and fourth laser. Then, solder the other end to the ground solder point between the first and second laser. This connects the first four laser's ground connections together.

Cut, splice and tin a piece of wire that is approximately 242 mm in length. 

Solder one of the ends of the wire to the ground solder point between the third and fourth laser. Then, solder the other end to the ground solder point between the fifth and sixth laser. This connects all eight of the laser's ground connections together.

Cut, splice and tin a piece of wire that is approximately 152 mm in length. Solder one of the ends of the wire to the ground solder point between the seventh and eighth laser. This wire will eventually connect to the FeatherWing Doubler.

Apply the heat shrink to the four power and four ground solder connections.