Could use some help with a GBA d-pad re-wire

I would desolder what you have and clean everything up with sandpaper. You can wire all of the grounds together and have just one ground line coming off, you don't need 2 wires coming back off of every button.

Buy some flux, and use it to tin all of the surfaces and wires. Flux is kind of like wicking glue that spreads the heat from the iron quickly and evenly. The result is usually a quick, perfect joint.
 
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