Step 4Attach one lead
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One of the motor leads goes directly to the power source; the other is interrupted by the switches. The lead going directly to the power source can be attached right away. Usually you'll need to solder this. Depending on your configuration you might need to add a bit of additional wire here. It doesn't matter which lead is attached, on either the motor or the battery holder, except for one thing. If one side of the battery terminal looks easier to tie thread to, solder the motor lead to the other one!
Since I had two sets of wires, I twisted a pair together, soldered them, and then hot glued for extra security.
Test the joint! Does the motor still run? Ok now take the batteries out again.