I'm building the $50 robot right now, and It's my first project soldering electronics. I heat sinked the voltage regulator when soldering it onto the board initially, but forgot to replace the heat sink when soldering in connections to it. I didn't have time to test it with a battery and voltmeter and I'm at work right now. How worried should I be? Is the heat sinking a requirement with the voltage regulator, or just extra caution? Also, I got everything from digikey, who's lowest shipping price is over $5. What's the least expensive way to replace the voltage regulator alone including shipping? Thanks.