I beg to differ that it "depends". I've tried the smaller wires. Anybody know the gauge of the wire that brush shunts are made of? Didn't slow down brushed motors any...

and doesn't electricity travel on the outside of wires? So low count 16 or high strand count 18. hmmm. I might be all wet on that "how electricity flows" thing. I haven't actually cared to look or remember for many years. I go with what looks the coolest. sad ain't it.

<---just being argumentative, but it does "depend". It's not a permanent installation, it's six hits with the soldering iron and 12" of wire. Try it!

Try it wtih both wires.