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Avoid soldering the wires to the motor on gearboxes without a motor cage; like your M4.
There should be a screw on the same side as the broken wire terminal. The easiest fix is to get a thin strip of metal and bore a hole into it. Then carefully remove that screw and replace it immediately, but through your little tab of metal. Now you have a new wire terminal. It is in slightly the wrong location, but it is the easiest fix.
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