Oh, and make sure you apply solder to the wire ends before you solder to the ESC. A "helping hand" is of great use here, as the wires get smokin' hot!
-very handy for all the soldering actually, can't live without it anymore!!!
Another tip is to use cleaning gum to make the ESC stay put while soldering.
So here's the procedure:
1) hold the ESC in place to your workbench with cleaning gum (for instance Xceed), at an angle is often practial
2) use the helping hand to hold the wire one at a time, apply solder to the end first.
3) Let it cool down, positon the wire into the ESC hole (I sometime enlargen them with a Dremel to get the wire through). Use the helping hand to keep it in position.
4) Hold the soldering iron with one hand, the solder with the other...
BINGO!
